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