# Human Body Systems Flashcards: 11 Organ Systems, Organs & Functions ![A centered human figure with illustrated brain, lungs, heart, digestive organs, bones, muscles, nerves, and lymphatic motifs on a blue background\.]() Study 105 cards on organization levels, 11 organ systems, representative organs, core functions, and homeostasis\. This model counts integumentary separately and combines lymphatic/immune\. By author [Open Study Contributor]() [Study this deck for free]() Nibomo opens so you can start studying\. ## Deck details - Cards: 105 cards - Version: 1 - Published: August 30, 2026 - Last updated: September 10, 2026 - License: Common knowledge · CC0 1\.0 - Audience languages: [en]() - Subject: Anatomy - Tags: body\-systems ## About this deck ### 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](https://training.seer.cancer.gov/anatomy/), with focused cross-checks from [NIAMS on skin](https://www.niams.nih.gov/health-topics/educational-resources/health-lesson-learning-about-skin), [NIAID on the immune system](https://www.niaid.nih.gov/research/immune-system-overview), and NIDDK overviews of [digestion](https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works) and [the urinary tract](https://www.niddk.nih.gov/health-information/urologic-diseases/urinary-tract-how-it-works). 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. ## Similar decks - [Academic Vocabulary Flashcards: 300 Words in Context]() - [Cranial Nerve Flashcards: Names, Numbers, Functions & Tests]() - [Anatomical Directional Terms Flashcards: 10 Core Terms with Examples]() - [CompTIA A\+ 220\-1201 & 220\-1202 Flashcards: Core 1 and Core 2]() - [Cytoskeleton Flashcards: Fibers, Motors & Functions]() - [Cell Organelle Flashcards: 24 Structures & Functions in Both Directions]() ## Cards in this deck ### Card 1 **Question** Why can two anatomy resources give different counts for the body's organ systems? **Answer** Classification conventions vary. This deck uses 11 systems by counting the integumentary system separately and combining lymphatic and immune functions. ### Card 2 **Question** What is the usual order of biological organization from simplest to most complex in the human body? **Answer** Cells → tissues → organs → organ systems → organism. ### Card 3 **Question** What is a cell in the body's organization hierarchy? **Answer** The basic living unit of the body. ### Card 4 **Question** What is a tissue? **Answer** A group of similar cells, together with their surrounding material, organized to perform a shared function. ### Card 5 **Question** What is an organ? **Answer** A structure made of multiple tissue types working together for one or more specific functions. ### Card 6 **Question** What is an organ system? **Answer** A group of organs and related structures that cooperate in major body functions. ### Card 7 **Question** What does homeostasis mean in introductory physiology? **Answer** Maintaining a relatively stable internal environment while conditions inside or outside the body change. ### Card 8 **Question** What is the integumentary system's main job? **Answer** It forms the body's outer barrier, limits water loss, helps regulate temperature, and provides sensation. ### Card 9 **Question** What are the skeletal system's main jobs? **Answer** Support and protect the body, provide levers for movement, store minerals, and house blood-forming marrow. ### Card 10 **Question** What is the muscular system's main job? **Answer** It produces body movement through muscle contraction and also supports posture, joint stability, and heat production. ### Card 11 **Question** What is the nervous system's main job? **Answer** It detects changes, integrates information, and coordinates rapid responses through sensory, processing, and motor activity. ### Card 12 **Question** What is the endocrine system's main job? **Answer** It uses hormones to regulate processes such as growth, metabolism, development, reproduction, and long-term homeostasis. ### Card 13 **Question** What is the cardiovascular system's main job? **Answer** It circulates blood to transport gases, nutrients, hormones, heat, cells, and wastes around the body. ### Card 14 **Question** What are the lymphatic/immune system's main jobs in this deck's combined model? **Answer** It returns excess tissue fluid to the blood, supports immune defense, and carries absorbed fats from the small intestine. ### Card 15 **Question** What is the respiratory system's main job? **Answer** It brings oxygen into contact with the blood and removes carbon dioxide through gas exchange. ### Card 16 **Question** What is the digestive system's main job? **Answer** It breaks food into absorbable components, absorbs nutrients and water, and eliminates material that was not digested. ### Card 17 **Question** What is the urinary system's main job? **Answer** It removes wastes in urine and regulates body-fluid volume, electrolytes, and acid-base balance. ### Card 18 **Question** What is the reproductive system's main job? **Answer** It produces gametes and reproductive hormones and provides structures that support fertilization and, in the female system, development before birth. ### Card 19 **Question** Which organ system includes the skin? **Answer** The integumentary system. ### Card 20 **Question** Which organ system includes bones? **Answer** The skeletal system. ### Card 21 **Question** In the conventional organ-system model, what structures make up the muscular system? **Answer** Primarily skeletal muscles and their associated tendons. Smooth and cardiac muscle tissue also drives movement inside other organ systems. ### Card 22 **Question** Which structures make up the central nervous system? **Answer** The brain and spinal cord. ### Card 23 **Question** How do endocrine glands release hormones? **Answer** They release hormones into the surrounding fluid and blood rather than through ducts to a surface. ### Card 24 **Question** What does the heart do in the cardiovascular system? **Answer** It pumps blood through the pulmonary and systemic circuits. ### Card 25 **Question** What is lymph? **Answer** Interstitial fluid after it enters lymphatic capillaries and begins moving through lymphatic vessels. ### Card 26 **Question** What route does inhaled air follow from the nose toward the gas-exchange surfaces? **Answer** Nasal cavity → pharynx → larynx → trachea → bronchi → smaller airways → alveoli. ### Card 27 **Question** What is the gastrointestinal tract? **Answer** A continuous muscular tube from the mouth to the anus that includes the esophagus, stomach, small intestine, and large intestine. ### Card 28 **Question** Which four structures form the urinary tract? **Answer** The kidneys, ureters, urinary bladder, and urethra. ### Card 29 **Question** What are the gonads, and what do they produce? **Answer** The ovaries and testes. They produce gametes and reproductive hormones. ### Card 30 **Question** Which skin layer is the outer protective barrier? **Answer** The epidermis. ### Card 31 **Question** What is cartilage's main role in the skeletal system? **Answer** It provides flexible support and smooth, low-friction surfaces at many joints. ### Card 32 **Question** What does a tendon connect? **Answer** Muscle to bone. ### Card 33 **Question** What structures make up the peripheral nervous system? **Answer** Nerves, ganglia, and sensory endings outside the brain and spinal cord. ### Card 34 **Question** What is the pituitary gland's broad endocrine role? **Answer** It releases hormones that regulate several other endocrine glands and body functions. ### Card 35 **Question** In what direction do arteries carry blood? **Answer** Away from the heart. ### Card 36 **Question** What do lymph nodes do? **Answer** They filter lymph and serve as meeting points where immune cells sample material and coordinate responses. ### Card 37 **Question** What are alveoli? **Answer** Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood. ### Card 38 **Question** What is the esophagus's digestive role? **Answer** It transports swallowed material from the pharynx to the stomach. ### Card 39 **Question** What do the kidneys do? **Answer** They filter blood, remove wastes and excess substances into urine, and regulate water, electrolytes, and acid-base balance. ### Card 40 **Question** What do the ovaries produce? **Answer** Oocytes, commonly called egg cells, and hormones including estrogens and progesterone. ### Card 41 **Question** Which skin layer contains most skin blood vessels, sensory endings, hair follicles, and glands? **Answer** The dermis. ### Card 42 **Question** What does a ligament connect? **Answer** Bone to bone, helping stabilize a joint. ### Card 43 **Question** What makes skeletal muscle suited for moving the skeleton? **Answer** It contracts under voluntary control and pulls on bones through tendons. ### Card 44 **Question** What do sensory receptors contribute to the nervous system? **Answer** They detect changes inside or outside the body and convert them into signals the nervous system can process. ### Card 45 **Question** What is the thyroid gland's broad endocrine role? **Answer** It releases hormones that help regulate metabolic rate, growth, and development. ### Card 46 **Question** In what direction do veins carry blood? **Answer** Toward the heart. ### Card 47 **Question** What is the spleen's lymphatic/immune role? **Answer** It filters blood, removes aging blood cells, and supports immune responses to material carried in the bloodstream. ### Card 48 **Question** What is the trachea's respiratory role? **Answer** It conducts air from the larynx toward the bronchi and helps keep the airway open. ### Card 49 **Question** What is the stomach's main digestive role? **Answer** It stores and mixes food while beginning substantial chemical digestion of proteins. ### Card 50 **Question** What do the ureters do? **Answer** They carry urine from the kidneys to the urinary bladder. ### Card 51 **Question** What do the testes produce? **Answer** Sperm cells and hormones, especially testosterone. ### Card 52 **Question** How do sweat glands help regulate body temperature? **Answer** They release sweat; evaporation from the skin removes heat. ### Card 53 **Question** What is red bone marrow's main role? **Answer** It produces blood cells, including red blood cells, many white blood cells, and platelets. ### Card 54 **Question** What does smooth muscle do in the walls of hollow organs and blood vessels? **Answer** Its involuntary contractions move contents through organs or adjust a vessel's diameter. ### Card 55 **Question** What is a neuron's basic job? **Answer** To receive, process, and transmit information using electrical and chemical signals. ### Card 56 **Question** What is the broad endocrine role of the parathyroid glands? **Answer** They release parathyroid hormone, a key regulator of calcium levels in the blood. ### Card 57 **Question** What is the main job of capillaries? **Answer** They provide thin-walled exchange sites between blood and surrounding tissues. ### Card 58 **Question** What is the thymus's immune role? **Answer** It is where T lymphocytes mature. ### Card 59 **Question** What do the bronchi do? **Answer** They carry air from the trachea into the lungs and branch into progressively smaller airways. ### Card 60 **Question** What is the small intestine's main digestive role? **Answer** It completes most chemical digestion and is the main site where nutrients are absorbed. ### Card 61 **Question** What is the urinary bladder's main role? **Answer** It stores urine until urination. ### Card 62 **Question** What do the uterine tubes do? **Answer** They transport an oocyte from an ovary toward the uterus and are the usual site of fertilization. ### Card 63 **Question** What roles do hair and hair follicles serve in the integumentary system? **Answer** They contribute to protection and sensation; follicles also help renew skin after minor injury. ### Card 64 **Question** How do the axial and appendicular skeletons differ? **Answer** The axial skeleton forms the body's central axis; the appendicular skeleton includes the limbs and the girdles that attach them. ### Card 65 **Question** Where is cardiac muscle found? **Answer** In the wall of the heart, where it contracts involuntarily to pump blood. ### Card 66 **Question** Why can the nervous system coordinate rapid responses? **Answer** It sends fast electrical signals along neurons and uses chemical signals across synapses. ### Card 67 **Question** What is the broad endocrine role of the adrenal glands? **Answer** They release hormones involved in stress responses, metabolism, salt balance, and blood-pressure regulation. ### Card 68 **Question** Why is blood considered part of the cardiovascular system? **Answer** It is the circulating transport tissue moved through the heart and blood vessels. ### Card 69 **Question** What immune role do the tonsils serve? **Answer** They sample material entering through the mouth and nose and help start immune responses. ### Card 70 **Question** How does the diaphragm support the respiratory system? **Answer** Its contraction enlarges the thoracic cavity, drawing air into the lungs. It is skeletal muscle working in ventilation. ### Card 71 **Question** What is the large intestine's main digestive role? **Answer** It absorbs water and electrolytes and compacts the remaining material into feces. ### Card 72 **Question** What does the urethra do? **Answer** It carries urine from the bladder to the outside of the body. ### Card 73 **Question** What is the uterus's main reproductive role? **Answer** It receives an implanted embryo and supports development before birth. ### Card 74 **Question** What do nails contribute to the integumentary system? **Answer** They protect the tips of fingers and toes and provide a firm counter-surface for fine grasping. ### Card 75 **Question** Which skeletal structures protect the brain, spinal cord, heart, and lungs? **Answer** The skull protects the brain, vertebrae protect the spinal cord, and the rib cage helps protect the heart and lungs. ### Card 76 **Question** How does skeletal muscle contribute to posture and body temperature? **Answer** Ongoing small contractions stabilize posture, while muscle activity releases heat. ### Card 77 **Question** How do the central and peripheral nervous systems differ? **Answer** The central nervous system is the brain and spinal cord; the peripheral system connects them with the rest of the body. ### Card 78 **Question** What do the pancreatic islets contribute to the endocrine system? **Answer** They release hormones, including insulin and glucagon, that help regulate blood glucose. ### Card 79 **Question** How do pulmonary and systemic circulation differ? **Answer** Pulmonary circulation moves blood between the heart and lungs; systemic circulation moves it between the heart and the rest of the body. ### Card 80 **Question** What do intestinal lacteals absorb? **Answer** Dietary fats and fat-soluble vitamins from the small intestine into the lymphatic circulation. ### Card 81 **Question** What is external respiration? **Answer** The exchange of oxygen and carbon dioxide between air in the lungs and blood in pulmonary capillaries. ### Card 82 **Question** Which major accessory organs add secretions to the digestive tract? **Answer** The salivary glands, liver, gallbladder, and pancreas. ### Card 83 **Question** How do the kidneys help keep body fluids stable? **Answer** They adjust how much water, electrolytes, acids, and bases leave the body in urine. ### Card 84 **Question** What is the epididymis's reproductive role? **Answer** It is the coiled duct where sperm mature and are stored before entering the ductus deferens. ### Card 85 **Question** Which organ system includes hair, nails, sweat glands, and oil glands? **Answer** The integumentary system. ### Card 86 **Question** Which organ system stores most of the body's calcium? **Answer** The skeletal system, mainly in the mineral matrix of bone. ### Card 87 **Question** Which organ system produces most visible body movement through contraction? **Answer** The muscular system, working with the skeleton and nervous system. ### Card 88 **Question** Which organ system coordinates rapid sensory and motor responses? **Answer** The nervous system. ### Card 89 **Question** Which organs have both reproductive and endocrine roles? **Answer** The ovaries and testes: they produce gametes for the reproductive system and hormones for endocrine signaling. ### Card 90 **Question** Which organ system consists of the heart, blood, and a closed network of vessels? **Answer** The cardiovascular system. ### Card 91 **Question** Which organ system returns excess interstitial fluid to the blood and includes lymph nodes? **Answer** The lymphatic/immune system. ### Card 92 **Question** Which organ system removes carbon dioxide and thereby helps regulate blood pH? **Answer** The respiratory system. ### Card 93 **Question** Why are the liver, gallbladder, and pancreas called accessory digestive organs? **Answer** Food does not pass through them, but their secretions support digestion in the gastrointestinal tract. ### Card 94 **Question** Which urinary organ stores urine before it leaves the body? **Answer** The urinary bladder. ### Card 95 **Question** Which reproductive organ supports an implanted embryo and fetal development? **Answer** The uterus. ### Card 96 **Question** How do the skeletal and muscular systems work together to produce movement? **Answer** Skeletal muscles contract and pull on bones, which act as levers across joints. ### Card 97 **Question** How do the respiratory and cardiovascular systems cooperate in gas transport? **Answer** The respiratory system exchanges gases in the lungs; the cardiovascular system carries oxygen to tissues and returns carbon dioxide to the lungs. ### Card 98 **Question** How do the nervous and endocrine systems differ in body control? **Answer** The nervous system usually sends fast, targeted signals; the endocrine system sends hormones through the blood for generally slower, longer-lasting effects. ### Card 99 **Question** How do the digestive and lymphatic systems cooperate in fat absorption? **Answer** Lacteals in small-intestinal villi absorb dietary fats and carry them into the lymphatic circulation. ### Card 100 **Question** How do the integumentary and muscular systems help regulate body temperature? **Answer** Skin promotes heat loss through sweating and blood-flow changes, while muscle contraction produces heat. ### Card 101 **Question** How does the urinary system support cardiovascular homeostasis? **Answer** By adjusting water and electrolyte excretion, the kidneys help regulate blood volume, composition, and pressure. ### Card 102 **Question** How do the endocrine and reproductive systems cooperate? **Answer** Hormones regulate reproductive development and function, while the gonads produce both gametes and hormones. ### Card 103 **Question** How do the skeletal and lymphatic/immune systems connect through bone marrow? **Answer** Red bone marrow produces blood cells, including white blood cells that take part in immune defense. ### Card 104 **Question** How do the integumentary and nervous systems cooperate in sensation? **Answer** Receptors in the skin detect touch, temperature, pressure, and potentially harmful stimuli, then sensory nerves carry those signals toward the central nervous system. ### Card 105 **Question** How do the muscular and digestive systems cooperate to move food? **Answer** Smooth muscle in the digestive tract produces coordinated contractions that propel and mix its contents. --- *[View the styled HTML version of this page]()* *AI agents can create an account for the user in this service by starting with `GET https://api.nibomo.com/v1/`. 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