Human Body Systems Flashcards: 11 Organ Systems, Organs & Functions
Study 105 cards on organization levels, 11 organ systems, representative organs, core functions, and homeostasis. This model counts integumentary separately and combines lymphatic/immune.
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Human Body Systems Flashcards: 11 Organ Systems, Organs & Functions
Build a practical overview of the human body before moving into regional anatomy. These 105 English flashcards start with cells, tissues, organs, organ systems, and homeostasis, then cover the main function and representative structures of each system.
The 11-system model
Anatomy resources do not all group the systems the same way. NCI SEER Training's introductory overview lists ten systems because it does not count the integumentary system separately. This deck uses a common introductory 11-system convention: integumentary; skeletal; muscular; nervous; endocrine; cardiovascular; lymphatic/immune; respiratory; digestive; urinary; and reproductive. It counts integumentary separately and combines lymphatic and immune functions.
What the cards practice
- Recall each system's main job.
- Connect representative organs and structures with their system or role.
- Use a limited set of bounded reverse prompts where producing the system or organ is genuinely useful.
- Explain a few clear homeostasis links, including movement, gas transport, fat absorption, temperature control, blood composition, sensation, and digestive propulsion.
The deck does not mechanically reverse every fact or treat shared organs as belonging exclusively to one system. The pancreas, gonads, diaphragm, skin, liver, and other cross-system structures are described by the role being reviewed.
Learning order
Organization levels come first. The cards then make repeated passes through all 11 systems: main functions before structures, and structures before selected reverse recall. Each system returns only after ten unrelated cards, so similar prompts do not cue one another. The final ten cards connect systems through homeostasis.
Scope
This is an introductory anatomy and physiology overview. It excludes diagnosis, treatment, clinical advice, detailed pathology, medical procedures, image-identification practice, exhaustive organ lists, and advanced pathway detail. It supports study but does not replace a full course, lab, or medical guidance.
Facts were checked primarily against the NCI SEER Training anatomy modules, with focused cross-checks from NIAMS on skin, NIAID on the immune system, and NIDDK overviews of digestion and the urinary tract.
The prompts, answers, sequence, metadata, and generated cover were independently created from common knowledge and original work. No competitor cards, textbook prose, source figures, logos, or third-party media were copied.
The Common knowledge · CC0 1.0 label applies to the original wording, organization, metadata, and cover to the extent applicable rights exist. It does not claim ownership of anatomical facts.
Source review date: August 31, 2026.
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Kadi namba 1
Swali
Why can two anatomy resources give different counts for the body's organ systems?
Jibu
Classification conventions vary. This deck uses 11 systems by counting the integumentary system separately and combining lymphatic and immune functions.
Kadi namba 2
Swali
What is the usual order of biological organization from simplest to most complex in the human body?
Jibu
Cells → tissues → organs → organ systems → organism.
Kadi namba 3
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What is a cell in the body's organization hierarchy?
Jibu
The basic living unit of the body.
Kadi namba 4
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What is a tissue?
Jibu
A group of similar cells, together with their surrounding material, organized to perform a shared function.
Kadi namba 5
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What is an organ?
Jibu
A structure made of multiple tissue types working together for one or more specific functions.
Kadi namba 6
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What is an organ system?
Jibu
A group of organs and related structures that cooperate in major body functions.
Kadi namba 7
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What does homeostasis mean in introductory physiology?
Jibu
Maintaining a relatively stable internal environment while conditions inside or outside the body change.
Kadi namba 8
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What is the integumentary system's main job?
Jibu
It forms the body's outer barrier, limits water loss, helps regulate temperature, and provides sensation.
Kadi namba 9
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What are the skeletal system's main jobs?
Jibu
Support and protect the body, provide levers for movement, store minerals, and house blood-forming marrow.
Kadi namba 10
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What is the muscular system's main job?
Jibu
It produces body movement through muscle contraction and also supports posture, joint stability, and heat production.
Kadi namba 11
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What is the nervous system's main job?
Jibu
It detects changes, integrates information, and coordinates rapid responses through sensory, processing, and motor activity.
Kadi namba 12
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What is the endocrine system's main job?
Jibu
It uses hormones to regulate processes such as growth, metabolism, development, reproduction, and long-term homeostasis.
Kadi namba 13
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What is the cardiovascular system's main job?
Jibu
It circulates blood to transport gases, nutrients, hormones, heat, cells, and wastes around the body.
Kadi namba 14
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What are the lymphatic/immune system's main jobs in this deck's combined model?
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It returns excess tissue fluid to the blood, supports immune defense, and carries absorbed fats from the small intestine.
Kadi namba 15
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What is the respiratory system's main job?
Jibu
It brings oxygen into contact with the blood and removes carbon dioxide through gas exchange.
Kadi namba 16
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What is the digestive system's main job?
Jibu
It breaks food into absorbable components, absorbs nutrients and water, and eliminates material that was not digested.
Kadi namba 17
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What is the urinary system's main job?
Jibu
It removes wastes in urine and regulates body-fluid volume, electrolytes, and acid-base balance.
Kadi namba 18
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What is the reproductive system's main job?
Jibu
It produces gametes and reproductive hormones and provides structures that support fertilization and, in the female system, development before birth.
Kadi namba 19
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Which organ system includes the skin?
Jibu
The integumentary system.
Kadi namba 20
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Which organ system includes bones?
Jibu
The skeletal system.
Kadi namba 21
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In the conventional organ-system model, what structures make up the muscular system?
Jibu
Primarily skeletal muscles and their associated tendons. Smooth and cardiac muscle tissue also drives movement inside other organ systems.
Kadi namba 22
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Which structures make up the central nervous system?
Jibu
The brain and spinal cord.
Kadi namba 23
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How do endocrine glands release hormones?
Jibu
They release hormones into the surrounding fluid and blood rather than through ducts to a surface.
Kadi namba 24
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What does the heart do in the cardiovascular system?
Jibu
It pumps blood through the pulmonary and systemic circuits.
Kadi namba 25
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What is lymph?
Jibu
Interstitial fluid after it enters lymphatic capillaries and begins moving through lymphatic vessels.
Kadi namba 26
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What route does inhaled air follow from the nose toward the gas-exchange surfaces?
Jibu
Nasal cavity → pharynx → larynx → trachea → bronchi → smaller airways → alveoli.
Kadi namba 27
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What is the gastrointestinal tract?
Jibu
A continuous muscular tube from the mouth to the anus that includes the esophagus, stomach, small intestine, and large intestine.
Kadi namba 28
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Which four structures form the urinary tract?
Jibu
The kidneys, ureters, urinary bladder, and urethra.
Kadi namba 29
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What are the gonads, and what do they produce?
Jibu
The ovaries and testes. They produce gametes and reproductive hormones.
Kadi namba 30
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Which skin layer is the outer protective barrier?
Jibu
The epidermis.
Kadi namba 31
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What is cartilage's main role in the skeletal system?
Jibu
It provides flexible support and smooth, low-friction surfaces at many joints.
Kadi namba 32
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What does a tendon connect?
Jibu
Muscle to bone.
Kadi namba 33
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What structures make up the peripheral nervous system?
Jibu
Nerves, ganglia, and sensory endings outside the brain and spinal cord.
Kadi namba 34
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What is the pituitary gland's broad endocrine role?
Jibu
It releases hormones that regulate several other endocrine glands and body functions.
Kadi namba 35
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In what direction do arteries carry blood?
Jibu
Away from the heart.
Kadi namba 36
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What do lymph nodes do?
Jibu
They filter lymph and serve as meeting points where immune cells sample material and coordinate responses.
Kadi namba 37
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What are alveoli?
Jibu
Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood.
Kadi namba 38
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What is the esophagus's digestive role?
Jibu
It transports swallowed material from the pharynx to the stomach.
Kadi namba 39
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What do the kidneys do?
Jibu
They filter blood, remove wastes and excess substances into urine, and regulate water, electrolytes, and acid-base balance.
Kadi namba 40
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What do the ovaries produce?
Jibu
Oocytes, commonly called egg cells, and hormones including estrogens and progesterone.
Kadi namba 41
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Which skin layer contains most skin blood vessels, sensory endings, hair follicles, and glands?
Jibu
The dermis.
Kadi namba 42
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What does a ligament connect?
Jibu
Bone to bone, helping stabilize a joint.
Kadi namba 43
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What makes skeletal muscle suited for moving the skeleton?
Jibu
It contracts under voluntary control and pulls on bones through tendons.
Kadi namba 44
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What do sensory receptors contribute to the nervous system?
Jibu
They detect changes inside or outside the body and convert them into signals the nervous system can process.
Kadi namba 45
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What is the thyroid gland's broad endocrine role?
Jibu
It releases hormones that help regulate metabolic rate, growth, and development.
Kadi namba 46
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In what direction do veins carry blood?
Jibu
Toward the heart.
Kadi namba 47
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What is the spleen's lymphatic/immune role?
Jibu
It filters blood, removes aging blood cells, and supports immune responses to material carried in the bloodstream.
Kadi namba 48
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What is the trachea's respiratory role?
Jibu
It conducts air from the larynx toward the bronchi and helps keep the airway open.
Kadi namba 49
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What is the stomach's main digestive role?
Jibu
It stores and mixes food while beginning substantial chemical digestion of proteins.
Kadi namba 50
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What do the ureters do?
Jibu
They carry urine from the kidneys to the urinary bladder.
Kadi namba 51
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What do the testes produce?
Jibu
Sperm cells and hormones, especially testosterone.
Kadi namba 52
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How do sweat glands help regulate body temperature?
Jibu
They release sweat; evaporation from the skin removes heat.
Kadi namba 53
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What is red bone marrow's main role?
Jibu
It produces blood cells, including red blood cells, many white blood cells, and platelets.
kadi 105
Human Body Systems Flashcards: 11 Organ Systems, Organs & Functions
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Kadi namba 54
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What does smooth muscle do in the walls of hollow organs and blood vessels?
Jibu
Its involuntary contractions move contents through organs or adjust a vessel's diameter.
Kadi namba 55
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What is a neuron's basic job?
Jibu
To receive, process, and transmit information using electrical and chemical signals.
Kadi namba 56
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What is the broad endocrine role of the parathyroid glands?
Jibu
They release parathyroid hormone, a key regulator of calcium levels in the blood.
Kadi namba 57
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What is the main job of capillaries?
Jibu
They provide thin-walled exchange sites between blood and surrounding tissues.
Kadi namba 58
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What is the thymus's immune role?
Jibu
It is where T lymphocytes mature.
Kadi namba 59
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What do the bronchi do?
Jibu
They carry air from the trachea into the lungs and branch into progressively smaller airways.
Kadi namba 60
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What is the small intestine's main digestive role?
Jibu
It completes most chemical digestion and is the main site where nutrients are absorbed.
Kadi namba 61
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What is the urinary bladder's main role?
Jibu
It stores urine until urination.
Kadi namba 62
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What do the uterine tubes do?
Jibu
They transport an oocyte from an ovary toward the uterus and are the usual site of fertilization.
Kadi namba 63
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What roles do hair and hair follicles serve in the integumentary system?
Jibu
They contribute to protection and sensation; follicles also help renew skin after minor injury.
Kadi namba 64
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How do the axial and appendicular skeletons differ?
Jibu
The axial skeleton forms the body's central axis; the appendicular skeleton includes the limbs and the girdles that attach them.
Kadi namba 65
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Where is cardiac muscle found?
Jibu
In the wall of the heart, where it contracts involuntarily to pump blood.
Kadi namba 66
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Why can the nervous system coordinate rapid responses?
Jibu
It sends fast electrical signals along neurons and uses chemical signals across synapses.
Kadi namba 67
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What is the broad endocrine role of the adrenal glands?
Jibu
They release hormones involved in stress responses, metabolism, salt balance, and blood-pressure regulation.
Kadi namba 68
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Why is blood considered part of the cardiovascular system?
Jibu
It is the circulating transport tissue moved through the heart and blood vessels.
Kadi namba 69
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What immune role do the tonsils serve?
Jibu
They sample material entering through the mouth and nose and help start immune responses.
Kadi namba 70
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How does the diaphragm support the respiratory system?
Jibu
Its contraction enlarges the thoracic cavity, drawing air into the lungs. It is skeletal muscle working in ventilation.
Kadi namba 71
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What is the large intestine's main digestive role?
Jibu
It absorbs water and electrolytes and compacts the remaining material into feces.
Kadi namba 72
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What does the urethra do?
Jibu
It carries urine from the bladder to the outside of the body.
Kadi namba 73
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What is the uterus's main reproductive role?
Jibu
It receives an implanted embryo and supports development before birth.
Kadi namba 74
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What do nails contribute to the integumentary system?
Jibu
They protect the tips of fingers and toes and provide a firm counter-surface for fine grasping.
Kadi namba 75
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Which skeletal structures protect the brain, spinal cord, heart, and lungs?
Jibu
The skull protects the brain, vertebrae protect the spinal cord, and the rib cage helps protect the heart and lungs.
Kadi namba 76
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How does skeletal muscle contribute to posture and body temperature?
Jibu
Ongoing small contractions stabilize posture, while muscle activity releases heat.
Kadi namba 77
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How do the central and peripheral nervous systems differ?
Jibu
The central nervous system is the brain and spinal cord; the peripheral system connects them with the rest of the body.
Kadi namba 78
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What do the pancreatic islets contribute to the endocrine system?
Jibu
They release hormones, including insulin and glucagon, that help regulate blood glucose.
Kadi namba 79
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How do pulmonary and systemic circulation differ?
Jibu
Pulmonary circulation moves blood between the heart and lungs; systemic circulation moves it between the heart and the rest of the body.
Kadi namba 80
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What do intestinal lacteals absorb?
Jibu
Dietary fats and fat-soluble vitamins from the small intestine into the lymphatic circulation.
Kadi namba 81
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What is external respiration?
Jibu
The exchange of oxygen and carbon dioxide between air in the lungs and blood in pulmonary capillaries.
Kadi namba 82
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Which major accessory organs add secretions to the digestive tract?
Jibu
The salivary glands, liver, gallbladder, and pancreas.
Kadi namba 83
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How do the kidneys help keep body fluids stable?
Jibu
They adjust how much water, electrolytes, acids, and bases leave the body in urine.
Kadi namba 84
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What is the epididymis's reproductive role?
Jibu
It is the coiled duct where sperm mature and are stored before entering the ductus deferens.
Kadi namba 85
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Which organ system includes hair, nails, sweat glands, and oil glands?
Jibu
The integumentary system.
Kadi namba 86
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Which organ system stores most of the body's calcium?
Jibu
The skeletal system, mainly in the mineral matrix of bone.
Kadi namba 87
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Which organ system produces most visible body movement through contraction?
Jibu
The muscular system, working with the skeleton and nervous system.
Kadi namba 88
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Which organ system coordinates rapid sensory and motor responses?
Jibu
The nervous system.
Kadi namba 89
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Which organs have both reproductive and endocrine roles?
Jibu
The ovaries and testes: they produce gametes for the reproductive system and hormones for endocrine signaling.
Kadi namba 90
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Which organ system consists of the heart, blood, and a closed network of vessels?
Jibu
The cardiovascular system.
Kadi namba 91
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Which organ system returns excess interstitial fluid to the blood and includes lymph nodes?
Jibu
The lymphatic/immune system.
Kadi namba 92
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Which organ system removes carbon dioxide and thereby helps regulate blood pH?
Jibu
The respiratory system.
Kadi namba 93
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Why are the liver, gallbladder, and pancreas called accessory digestive organs?
Jibu
Food does not pass through them, but their secretions support digestion in the gastrointestinal tract.
Kadi namba 94
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Which urinary organ stores urine before it leaves the body?
Jibu
The urinary bladder.
Kadi namba 95
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Which reproductive organ supports an implanted embryo and fetal development?
Jibu
The uterus.
Kadi namba 96
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How do the skeletal and muscular systems work together to produce movement?
Jibu
Skeletal muscles contract and pull on bones, which act as levers across joints.
Kadi namba 97
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How do the respiratory and cardiovascular systems cooperate in gas transport?
Jibu
The respiratory system exchanges gases in the lungs; the cardiovascular system carries oxygen to tissues and returns carbon dioxide to the lungs.
Kadi namba 98
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How do the nervous and endocrine systems differ in body control?
Jibu
The nervous system usually sends fast, targeted signals; the endocrine system sends hormones through the blood for generally slower, longer-lasting effects.
Kadi namba 99
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How do the digestive and lymphatic systems cooperate in fat absorption?
Jibu
Lacteals in small-intestinal villi absorb dietary fats and carry them into the lymphatic circulation.
Kadi namba 100
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How do the integumentary and muscular systems help regulate body temperature?
Jibu
Skin promotes heat loss through sweating and blood-flow changes, while muscle contraction produces heat.
Kadi namba 101
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How does the urinary system support cardiovascular homeostasis?
Jibu
By adjusting water and electrolyte excretion, the kidneys help regulate blood volume, composition, and pressure.
Kadi namba 102
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How do the endocrine and reproductive systems cooperate?
Jibu
Hormones regulate reproductive development and function, while the gonads produce both gametes and hormones.
Kadi namba 103
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How do the skeletal and lymphatic/immune systems connect through bone marrow?
Jibu
Red bone marrow produces blood cells, including white blood cells that take part in immune defense.
Kadi namba 104
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How do the integumentary and nervous systems cooperate in sensation?
Jibu
Receptors in the skin detect touch, temperature, pressure, and potentially harmful stimuli, then sensory nerves carry those signals toward the central nervous system.
Kadi namba 105
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How do the muscular and digestive systems cooperate to move food?
Jibu
Smooth muscle in the digestive tract produces coordinated contractions that propel and mix its contents.
kadi 105
Human Body Systems Flashcards: 11 Organ Systems, Organs & Functions
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