HESI A2 ANATOMY & PHYSIOLOGY EXAM | 300+ PRACTICE
QUESTIONS WITH ANSWERS & IN-DEPTH RATIONALES | 2026
UPDATE | VERSIONS 1 & 2 | INSTANT DOWNLOAD”
Q1: Which cellular process requires oxygen to produce ATP? A. Glycolysis B. Anaerobic
fermentation C. Aerobic respiration D. Passive diffusion
Answer: C. Aerobic respiration Rationale: Aerobic respiration occurs in mitochondria, using
oxygen to generate large amounts of ATP compared to anaerobic pathways.
Muscular System
Q2: Which type of muscle tissue is involuntary and found in the walls of hollow organs? A.
Skeletal B. Cardiac C. Smooth D. Voluntary
Answer: C. Smooth Rationale: Smooth muscle is non-striated, involuntary, and controls
movements in organs like the intestines and blood vessels.
Cardiovascular System
Q3: The sinoatrial (SA) node is located in which chamber of the heart? A. Right atrium B. Left
atrium C. Right ventricle D. Left ventricle
Answer: A. Right atrium Rationale: The SA node, the heart’s natural pacemaker, initiates
electrical impulses from the right atrium.
Respiratory System
Q4: Which structure prevents food from entering the trachea during swallowing? A. Uvula B.
Epiglottis C. Larynx D. Pharynx
Answer: B. Epiglottis Rationale: The epiglottis acts as a flap, closing over the trachea to direct
food into the esophagus.
Digestive System
Q5: Which organ produces bile to aid in fat digestion? A. Pancreas B. Liver C. Gallbladder D.
Small intestine
Answer: B. Liver Rationale: The liver produces bile, which emulsifies fats; the gallbladder stores
and releases it.
Nervous System
,Q6: The sympathetic nervous system is responsible for which response? A. Rest and digest B.
Fight or flight C. Voluntary movement D. Reflex arc
Answer: B. Fight or flight Rationale: Sympathetic activation increases heart rate, dilates pupils,
and mobilizes energy for emergencies.
Endocrine System
Q7: Which gland regulates metabolism through secretion of thyroxine (T4)? A. Pituitary B.
Thyroid C. Adrenal D. Pancreas
Answer: B. Thyroid Rationale: The thyroid gland produces T4 and T3, hormones that regulate
metabolic rate and energy use.
Urinary System
Q8: The functional unit of the kidney is the: A. Nephron B. Glomerulus C. Collecting duct D.
Renal pelvis
Answer: A. Nephron Rationale: Nephrons filter blood, reabsorb needed substances, and excrete
waste as urine.
Reproductive System
Q9: Which hormone triggers ovulation in females? A. Estrogen B. Progesterone C. Luteinizing
hormone (LH) D. Follicle-stimulating hormone (FSH)
Answer: C. Luteinizing hormone (LH) Rationale: LH surge causes the release of a mature egg
from the ovary.
Immune System
Q10: Which type of white blood cell produces antibodies? A. Neutrophils B. B lymphocytes C. T
lymphocytes D. Monocytes
Answer: B. B lymphocytes Rationale: B cells differentiate into plasma cells that secrete
antibodies to fight pathogens.
Skeletal System
Q11: Which type of joint allows the greatest range of motion? A. Hinge joint B. Ball-and-socket
joint C. Pivot joint D. Saddle joint
Answer: B. Ball-and-socket joint Rationale: Found in the shoulder and hip, ball-and-socket joints
allow movement in multiple planes, including rotation.
Muscular System
,Q12: Which protein in muscle fibers binds oxygen for aerobic respiration? A. Hemoglobin B.
Myosin C. Actin D. Myoglobin
Answer: D. Myoglobin Rationale: Myoglobin stores oxygen in muscle tissue, supporting
sustained contraction during aerobic activity.
Cardiovascular System
Q13: Which blood vessels carry oxygenated blood away from the heart? A. Veins B. Arteries C.
Capillaries D. Venules
Answer: B. Arteries Rationale: Arteries transport oxygen-rich blood from the heart to tissues,
except pulmonary arteries which carry deoxygenated blood.
Respiratory System
Q14: The primary muscle of respiration is the: A. Intercostals B. Diaphragm C. Abdominals D.
Sternocleidomastoid
Answer: B. Diaphragm Rationale: The diaphragm contracts and flattens during inspiration,
increasing thoracic volume for air intake.
Digestive System
Q15: Which enzyme begins carbohydrate digestion in the mouth? A. Pepsin B. Amylase C. Lipase
D. Trypsin
Answer: B. Amylase Rationale: Salivary amylase breaks down starch into maltose in the oral
cavity.
Nervous System
Q16: Which part of the neuron carries impulses away from the cell body? A. Dendrites B. Axon
C. Soma D. Synapse
Answer: B. Axon Rationale: Axons transmit electrical signals away from the neuron’s cell body
toward other neurons or muscles.
Endocrine System
Q17: The adrenal medulla secretes which hormones during stress? A. Cortisol and aldosterone
B. Epinephrine and norepinephrine C. Insulin and glucagon D. Thyroxine and calcitonin
Answer: B. Epinephrine and norepinephrine Rationale: These catecholamines trigger the fight-
or-flight response, increasing heart rate and blood pressure.
Urinary System
, Q18: Which structure filters blood plasma in the nephron? A. Loop of Henle B. Glomerulus C.
Collecting duct D. Renal pelvis
Answer: B. Glomerulus Rationale: The glomerulus is a capillary network that filters plasma into
Bowman’s capsule.
Reproductive System
Q19: In males, sperm production occurs in the: A. Epididymis B. Vas deferens C. Seminiferous
tubules D. Prostate gland
Answer: C. Seminiferous tubules Rationale: Located in the testes, seminiferous tubules are the
site of spermatogenesis.
Immune System
Q20: Which immune cells are primarily responsible for destroying virus-infected cells? A. B cells
B. Helper T cells C. Cytotoxic T cells D. Neutrophils
Answer: C. Cytotoxic T cells Rationale: Cytotoxic T cells directly attack and destroy infected or
cancerous cells.
Skeletal System
Q21: Which mineral is most important for bone strength? A. Sodium B. Calcium C. Potassium D.
Iron
Answer: B. Calcium Rationale: Calcium, stored in bone matrix, provides rigidity and strength.
Q22: The sternum is classified as which type of bone? A. Long bone B. Flat bone C. Irregular
bone D. Short bone
Answer: B. Flat bone Rationale: Flat bones protect organs and provide surface area for muscle
attachment.
Muscular System
Q23: Which ion is essential for muscle contraction? A. Sodium B. Calcium C. Potassium D.
Chloride
Answer: B. Calcium Rationale: Calcium binds to troponin, allowing actin-myosin interaction.
Q24: Which muscle is the primary flexor of the forearm? A. Triceps brachii B. Biceps brachii C.
Deltoid D. Latissimus dorsi
Answer: B. Biceps brachii Rationale: The biceps brachii flexes the elbow joint.
QUESTIONS WITH ANSWERS & IN-DEPTH RATIONALES | 2026
UPDATE | VERSIONS 1 & 2 | INSTANT DOWNLOAD”
Q1: Which cellular process requires oxygen to produce ATP? A. Glycolysis B. Anaerobic
fermentation C. Aerobic respiration D. Passive diffusion
Answer: C. Aerobic respiration Rationale: Aerobic respiration occurs in mitochondria, using
oxygen to generate large amounts of ATP compared to anaerobic pathways.
Muscular System
Q2: Which type of muscle tissue is involuntary and found in the walls of hollow organs? A.
Skeletal B. Cardiac C. Smooth D. Voluntary
Answer: C. Smooth Rationale: Smooth muscle is non-striated, involuntary, and controls
movements in organs like the intestines and blood vessels.
Cardiovascular System
Q3: The sinoatrial (SA) node is located in which chamber of the heart? A. Right atrium B. Left
atrium C. Right ventricle D. Left ventricle
Answer: A. Right atrium Rationale: The SA node, the heart’s natural pacemaker, initiates
electrical impulses from the right atrium.
Respiratory System
Q4: Which structure prevents food from entering the trachea during swallowing? A. Uvula B.
Epiglottis C. Larynx D. Pharynx
Answer: B. Epiglottis Rationale: The epiglottis acts as a flap, closing over the trachea to direct
food into the esophagus.
Digestive System
Q5: Which organ produces bile to aid in fat digestion? A. Pancreas B. Liver C. Gallbladder D.
Small intestine
Answer: B. Liver Rationale: The liver produces bile, which emulsifies fats; the gallbladder stores
and releases it.
Nervous System
,Q6: The sympathetic nervous system is responsible for which response? A. Rest and digest B.
Fight or flight C. Voluntary movement D. Reflex arc
Answer: B. Fight or flight Rationale: Sympathetic activation increases heart rate, dilates pupils,
and mobilizes energy for emergencies.
Endocrine System
Q7: Which gland regulates metabolism through secretion of thyroxine (T4)? A. Pituitary B.
Thyroid C. Adrenal D. Pancreas
Answer: B. Thyroid Rationale: The thyroid gland produces T4 and T3, hormones that regulate
metabolic rate and energy use.
Urinary System
Q8: The functional unit of the kidney is the: A. Nephron B. Glomerulus C. Collecting duct D.
Renal pelvis
Answer: A. Nephron Rationale: Nephrons filter blood, reabsorb needed substances, and excrete
waste as urine.
Reproductive System
Q9: Which hormone triggers ovulation in females? A. Estrogen B. Progesterone C. Luteinizing
hormone (LH) D. Follicle-stimulating hormone (FSH)
Answer: C. Luteinizing hormone (LH) Rationale: LH surge causes the release of a mature egg
from the ovary.
Immune System
Q10: Which type of white blood cell produces antibodies? A. Neutrophils B. B lymphocytes C. T
lymphocytes D. Monocytes
Answer: B. B lymphocytes Rationale: B cells differentiate into plasma cells that secrete
antibodies to fight pathogens.
Skeletal System
Q11: Which type of joint allows the greatest range of motion? A. Hinge joint B. Ball-and-socket
joint C. Pivot joint D. Saddle joint
Answer: B. Ball-and-socket joint Rationale: Found in the shoulder and hip, ball-and-socket joints
allow movement in multiple planes, including rotation.
Muscular System
,Q12: Which protein in muscle fibers binds oxygen for aerobic respiration? A. Hemoglobin B.
Myosin C. Actin D. Myoglobin
Answer: D. Myoglobin Rationale: Myoglobin stores oxygen in muscle tissue, supporting
sustained contraction during aerobic activity.
Cardiovascular System
Q13: Which blood vessels carry oxygenated blood away from the heart? A. Veins B. Arteries C.
Capillaries D. Venules
Answer: B. Arteries Rationale: Arteries transport oxygen-rich blood from the heart to tissues,
except pulmonary arteries which carry deoxygenated blood.
Respiratory System
Q14: The primary muscle of respiration is the: A. Intercostals B. Diaphragm C. Abdominals D.
Sternocleidomastoid
Answer: B. Diaphragm Rationale: The diaphragm contracts and flattens during inspiration,
increasing thoracic volume for air intake.
Digestive System
Q15: Which enzyme begins carbohydrate digestion in the mouth? A. Pepsin B. Amylase C. Lipase
D. Trypsin
Answer: B. Amylase Rationale: Salivary amylase breaks down starch into maltose in the oral
cavity.
Nervous System
Q16: Which part of the neuron carries impulses away from the cell body? A. Dendrites B. Axon
C. Soma D. Synapse
Answer: B. Axon Rationale: Axons transmit electrical signals away from the neuron’s cell body
toward other neurons or muscles.
Endocrine System
Q17: The adrenal medulla secretes which hormones during stress? A. Cortisol and aldosterone
B. Epinephrine and norepinephrine C. Insulin and glucagon D. Thyroxine and calcitonin
Answer: B. Epinephrine and norepinephrine Rationale: These catecholamines trigger the fight-
or-flight response, increasing heart rate and blood pressure.
Urinary System
, Q18: Which structure filters blood plasma in the nephron? A. Loop of Henle B. Glomerulus C.
Collecting duct D. Renal pelvis
Answer: B. Glomerulus Rationale: The glomerulus is a capillary network that filters plasma into
Bowman’s capsule.
Reproductive System
Q19: In males, sperm production occurs in the: A. Epididymis B. Vas deferens C. Seminiferous
tubules D. Prostate gland
Answer: C. Seminiferous tubules Rationale: Located in the testes, seminiferous tubules are the
site of spermatogenesis.
Immune System
Q20: Which immune cells are primarily responsible for destroying virus-infected cells? A. B cells
B. Helper T cells C. Cytotoxic T cells D. Neutrophils
Answer: C. Cytotoxic T cells Rationale: Cytotoxic T cells directly attack and destroy infected or
cancerous cells.
Skeletal System
Q21: Which mineral is most important for bone strength? A. Sodium B. Calcium C. Potassium D.
Iron
Answer: B. Calcium Rationale: Calcium, stored in bone matrix, provides rigidity and strength.
Q22: The sternum is classified as which type of bone? A. Long bone B. Flat bone C. Irregular
bone D. Short bone
Answer: B. Flat bone Rationale: Flat bones protect organs and provide surface area for muscle
attachment.
Muscular System
Q23: Which ion is essential for muscle contraction? A. Sodium B. Calcium C. Potassium D.
Chloride
Answer: B. Calcium Rationale: Calcium binds to troponin, allowing actin-myosin interaction.
Q24: Which muscle is the primary flexor of the forearm? A. Triceps brachii B. Biceps brachii C.
Deltoid D. Latissimus dorsi
Answer: B. Biceps brachii Rationale: The biceps brachii flexes the elbow joint.
