Human Anatomy & Physiology 2026 Updated Study Guide

1. What is the fundamental definition of "Homeostasis"? A) The process of cellular respiration B) The maintenance of a stable internal environment despite external changes C) The breakdown of glucose in the liver D) The structural organization of the skeletal system Correct Answer: B) The maintenance of a stable internal environment despite external changes 2. Which organ system is primarily responsible for the transport of oxygen and nutrients? A) Digestive system B) Cardiovascular system C) Respiratory system D) Lymphatic system Correct Answer: B) Cardiovascular system 3. What is the primary function of the "Mitochondria" within a human cell? A) Synthesis of proteins B) Production of ATP (cellular energy) via aerobic respiration C) Storage of genetic information D) Digestion of waste products Correct Answer: B) Production of ATP (cellular energy) via aerobic respiration 4. The "Central Nervous System" (CNS) consists of: A) Nerves and sensory receptors B) The brain and the spinal cord C) The sympathetic and parasympathetic nervous systems D) The autonomic nervous system only Correct Answer: B) The brain and the spinal cord 5. What is the "Neurotransmitter" primarily involved in muscle contraction? A) Serotonin B) Acetylcholine C) Dopamine D) GABA Correct Answer: B) Acetylcholine 6. Which hormone is released by the pancreas to lower blood glucose levels? A) Glucagon B) Insulin C) Adrenaline D) Thyroxine Correct Answer: B) Insulin 7. "Osteoblasts" are cells responsible for: A) Breaking down bone tissue B) Building and forming new bone tissue C) Transporting calcium in the blood D) Producing red blood cells Correct Answer: B) Building and forming new bone tissue 8. The "Alveoli" are the site of: A) Protein digestion B) Gas exchange (oxygen and carbon dioxide) in the lungs C) Nutrient absorption in the small intestine D) Filtration in the kidneys Correct Answer: B) Gas exchange (oxygen and carbon dioxide) in the lungs 9. What is the role of the "Nephron" in the kidney? A) To pump blood B) The functional unit responsible for blood filtration and urine formation C) To produce bile D) To store urine Correct Answer: B) The functional unit responsible for blood filtration and urine formation 10. "Systole" refers to the phase of the cardiac cycle where: A) The heart muscle relaxes B) The heart muscle contracts and pumps blood C) The valves close completely D) The pacemaker generates an electrical signal Correct Answer: B) The heart muscle contracts and pumps blood 11. Which blood vessels carry oxygenated blood away from the heart? A) Veins B) Arteries C) Capillaries D) Venules Correct Answer: B) Arteries 12. The "Villi" and "Microvilli" in the small intestine serve to: A) Protect the intestinal lining from acid B) Increase the surface area for nutrient absorption C) Move food through the digestive tract D) Break down proteins into amino acids Correct Answer: B) Increase the surface area for nutrient absorption 13. Which hormone is responsible for the "fight or flight" response? A) Estrogen B) Epinephrine (Adrenaline) C) Melatonin D) Insulin Correct Answer: B) Epinephrine (Adrenaline) 14. What is the primary function of the "Myelin Sheath" on an axon? A) To produce neurotransmitters B) To insulate the axon and increase the speed of electrical impulse conduction C) To provide nutrients to the neuron D) To prevent the neuron from dying Correct Answer: B) To insulate the axon and increase the speed of electrical impulse conduction 15. "Hemoglobin" is a protein found in red blood cells that functions to: A) Produce antibodies B) Bind and transport oxygen throughout the body C) Clot blood after an injury D) Regulate blood sugar Correct Answer: B) Bind and transport oxygen throughout the body 16. Which part of the brain controls balance and coordination? A) Cerebrum B) Cerebellum C) Hypothalamus D) Brainstem Correct Answer: B) Cerebellum 17. "Peristalsis" is: A) The chemical breakdown of food in the stomach B) The rhythmic, wave-like muscular contraction that moves food through the digestive tract C) The absorption of water in the large intestine D) The release of bile from the gallbladder Correct Answer: B) The rhythmic, wave-like muscular contraction that moves food through the digestive tract 18. What is the primary function of the "Lymphatic System"? A) To filter the blood B) To return excess interstitial fluid to the blood and support the immune system C) To produce digestive enzymes D) To regulate body temperature Correct Answer: B) To return excess interstitial fluid to the blood and support the immune system 19. "Red bone marrow" is responsible for: A) Storing fat B) Hematopoiesis (the production of red blood cells, white blood cells, and platelets) C) Breaking down old bones D) Providing structural support to the spine Correct Answer: B) Hematopoiesis (the production of red blood cells, white blood cells, and platelets) 20. Which layer of the skin contains blood vessels, nerves, and glands? A) Epidermis B) Dermis C) Hypodermis D) Stratum corneum Correct Answer: B) Dermis