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