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120 Human Body Systems Basics: Names, Functions & Key Organs Practice Questions (2026)

Below is a complete list of real practice questions you may be asked during the Human Body Systems Basics: Names, Functions & Key Organs. Try answering each one yourself before checking your knowledge. If you find questions you don’t know, you can study them using our interactive spaced-repetition flashcards that repeat what you forget.

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Full Question List

  1. Question 1

    What is a cell?

  2. Question 2

    What is a tissue?

  3. Question 3

    What is an organ?

  4. Question 4

    What is an organ system?

  5. Question 5

    What is homeostasis?

  6. Question 6

    What are the main levels of organization in the body?

  7. Question 7

    What is metabolism?

  8. Question 8

    What is ATP?

  9. Question 9

    What does the nucleus do?

  10. Question 10

    What are mitochondria?

  11. Question 11

    What is the skeletal system?

  12. Question 12

    What are the main functions of the skeletal system?

  13. Question 13

    What is bone marrow?

  14. Question 14

    What is a joint?

  15. Question 15

    What is cartilage?

  16. How many did you know?

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  17. Question 16

    What does the skull protect?

  18. Question 17

    What does the rib cage protect?

  19. Question 18

    What is the spine (vertebral column)?

  20. Question 19

    What is a ligament?

  21. Question 20

    How do bones grow and repair?

  22. Question 21

    What is the muscular system?

  23. Question 22

    What are the three types of muscle?

  24. Question 23

    What is skeletal muscle?

  25. Question 24

    What is smooth muscle?

  26. Question 25

    What is cardiac muscle?

  27. Question 26

    What is a tendon?

  28. Question 27

    How do muscles contract?

  29. Question 28

    What are antagonistic muscle pairs?

  30. Question 29

    Why do muscles produce heat?

  31. Question 30

    What causes muscle fatigue?

  32. How many did you know?

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  33. Question 31

    What is the circulatory (cardiovascular) system?

  34. Question 32

    What does the heart do?

  35. Question 33

    What are the four chambers of the heart?

  36. Question 34

    What are arteries?

  37. Question 35

    What are veins?

  38. Question 36

    What are capillaries?

  39. Question 37

    What is blood?

  40. Question 38

    What are red blood cells?

  41. Question 39

    What are white blood cells?

  42. Question 40

    What is blood pressure?

  43. Question 41

    What is the respiratory system?

  44. Question 42

    What is the pathway of air during breathing?

  45. Question 43

    What is the trachea?

  46. Question 44

    What are the lungs?

  47. Question 45

    What are alveoli?

  48. How many did you know?

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  49. Question 46

    What is the diaphragm?

  50. Question 47

    How does gas exchange work?

  51. Question 48

    What is cellular respiration?

  52. Question 49

    Why do we breathe faster during exercise?

  53. Question 50

    What protects the lungs?

  54. Question 51

    What is the digestive system?

  55. Question 52

    What is the pathway of food through the digestive system?

  56. Question 53

    What happens in the mouth?

  57. Question 54

    What is the esophagus?

  58. Question 55

    What does the stomach do?

  59. Question 56

    What is the small intestine?

  60. Question 57

    What is the large intestine (colon)?

  61. Question 58

    What does the liver do?

  62. Question 59

    What does the pancreas do?

  63. Question 60

    What is peristalsis?

  64. How many did you know?

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  65. Question 61

    What is the nervous system?

  66. Question 62

    What are the two main parts of the nervous system?

  67. Question 63

    What does the brain do?

  68. Question 64

    What are the main parts of the brain?

  69. Question 65

    What does the spinal cord do?

  70. Question 66

    What is a neuron?

  71. Question 67

    What is a reflex?

  72. Question 68

    What is the difference between sensory and motor neurons?

  73. Question 69

    What are the five senses?

  74. Question 70

    How fast do nerve signals travel?

  75. Question 71

    What is the endocrine system?

  76. Question 72

    What are hormones?

  77. Question 73

    What is the pituitary gland?

  78. Question 74

    What does the thyroid gland do?

  79. Question 75

    What does the pancreas do as an endocrine organ?

  80. How many did you know?

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  81. Question 76

    What are the adrenal glands?

  82. Question 77

    What do reproductive glands do?

  83. Question 78

    How do hormones work?

  84. Question 79

    What is a negative feedback loop?

  85. Question 80

    What hormone regulates sleep?

  86. Question 81

    What is the immune system?

  87. Question 82

    What are the body's first lines of defense?

  88. Question 83

    What are pathogens?

  89. Question 84

    What is the lymphatic system?

  90. Question 85

    What are lymph nodes?

  91. Question 86

    What does the spleen do?

  92. Question 87

    What are antibodies?

  93. Question 88

    What is immunity?

  94. Question 89

    How do vaccines work?

  95. Question 90

    What causes inflammation?

  96. How many did you know?

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  97. Question 91

    What is the urinary (excretory) system?

  98. Question 92

    What do the kidneys do?

  99. Question 93

    What are nephrons?

  100. Question 94

    What are the ureters?

  101. Question 95

    What is the bladder?

  102. Question 96

    What is urine?

  103. Question 97

    Why is kidney function important?

  104. Question 98

    What happens if kidneys fail?

  105. Question 99

    How much urine do kidneys produce daily?

  106. Question 100

    What is the urethra?

  107. Question 101

    What is the integumentary system?

  108. Question 102

    What are the functions of skin?

  109. Question 103

    What are the layers of skin?

  110. Question 104

    How does skin regulate temperature?

  111. Question 105

    What is melanin?

  112. How many did you know?

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  113. Question 106

    What do sweat glands do?

  114. Question 107

    What do oil (sebaceous) glands do?

  115. Question 108

    How does skin heal wounds?

  116. Question 109

    What is the purpose of hair?

  117. Question 110

    What is the purpose of nails?

  118. Question 111

    What is the reproductive system?

  119. Question 112

    What are gametes?

  120. Question 113

    What is fertilization?

  121. Question 114

    What are the main male reproductive organs?

  122. Question 115

    What are the main female reproductive organs?

  123. Question 116

    What is the menstrual cycle?

  124. Question 117

    Where does fetal development occur?

  125. Question 118

    What is the placenta?

  126. Question 119

    What is puberty?

  127. Question 120

    How do all body systems work together?

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