BIOS 256 EXAM 3 CHAMBERLAIN EXAM
QUESTIONS AND CORRECT ANSWERS (verified
answers) Q & A 2026 /INSTANT DOWNLOAD PDF
1. Which organ is primarily responsible for regulating blood calcium levels?
A. Liver
B. Thyroid gland
C. Parathyroid gland
D. Pancreas
Correct Answer: C
Rationale: The parathyroid glands secrete parathyroid hormone (PTH), which
directly regulates calcium homeostasis in the blood.
2. Which blood vessel carries oxygenated blood away from the heart?
A. Veins
B. Arteries
C. Venules
D. Capillaries
Correct Answer: B
Rationale: Arteries carry blood away from the heart, and most (except pulmonary
arteries) carry oxygen-rich blood.
3. The functional unit of the kidney is the:
A. Neuron
B. Nephron
,C. Alveolus
D. Glomerulus
Correct Answer: B
Rationale: The nephron is responsible for filtration, reabsorption, and urine
formation.
4. Insulin is produced by which cells?
A. Alpha cells
B. Beta cells
C. Delta cells
D. Acinar cells
Correct Answer: B
Rationale: Beta cells in the pancreas produce insulin to lower blood glucose levels.
5. Which part of the brain controls balance and coordination?
A. Cerebrum
B. Cerebellum
C. Medulla oblongata
D. Thalamus
Correct Answer: B
Rationale: The cerebellum regulates coordination, posture, and balance.
6. Gas exchange in the lungs occurs in the:
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
,Correct Answer: C
Rationale: Alveoli are tiny air sacs where oxygen and carbon dioxide are
exchanged.
7. The pacemaker of the heart is the:
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale: The sinoatrial (SA) node initiates electrical impulses controlling heart
rhythm.
8. Which hormone increases blood glucose levels?
A. Insulin
B. Glucagon
C. Thyroxine
D. Aldosterone
Correct Answer: B
Rationale: Glucagon raises blood glucose by stimulating glycogen breakdown.
9. The largest organ of the human body is the:
A. Liver
B. Brain
C. Skin
D. Heart
Correct Answer: C
Rationale: The skin is the largest organ in terms of surface area.
, 10. Which blood cells are responsible for immunity?
A. Erythrocytes
B. Leukocytes
C. Thrombocytes
D. Plasma cells only
Correct Answer: B
Rationale: White blood cells (leukocytes) defend against pathogens.
11. The respiratory center is located in the:
A. Cerebrum
B. Medulla oblongata
C. Hypothalamus
D. Spinal cord
Correct Answer: B
Rationale: The medulla oblongata controls breathing rhythm.
12. The hormone that regulates water balance is:
A. Insulin
B. ADH
C. Estrogen
D. Cortisol
Correct Answer: B
Rationale: Antidiuretic hormone (ADH) controls water reabsorption in kidneys.
13. The structural and functional unit of the nervous system is the:
QUESTIONS AND CORRECT ANSWERS (verified
answers) Q & A 2026 /INSTANT DOWNLOAD PDF
1. Which organ is primarily responsible for regulating blood calcium levels?
A. Liver
B. Thyroid gland
C. Parathyroid gland
D. Pancreas
Correct Answer: C
Rationale: The parathyroid glands secrete parathyroid hormone (PTH), which
directly regulates calcium homeostasis in the blood.
2. Which blood vessel carries oxygenated blood away from the heart?
A. Veins
B. Arteries
C. Venules
D. Capillaries
Correct Answer: B
Rationale: Arteries carry blood away from the heart, and most (except pulmonary
arteries) carry oxygen-rich blood.
3. The functional unit of the kidney is the:
A. Neuron
B. Nephron
,C. Alveolus
D. Glomerulus
Correct Answer: B
Rationale: The nephron is responsible for filtration, reabsorption, and urine
formation.
4. Insulin is produced by which cells?
A. Alpha cells
B. Beta cells
C. Delta cells
D. Acinar cells
Correct Answer: B
Rationale: Beta cells in the pancreas produce insulin to lower blood glucose levels.
5. Which part of the brain controls balance and coordination?
A. Cerebrum
B. Cerebellum
C. Medulla oblongata
D. Thalamus
Correct Answer: B
Rationale: The cerebellum regulates coordination, posture, and balance.
6. Gas exchange in the lungs occurs in the:
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx
,Correct Answer: C
Rationale: Alveoli are tiny air sacs where oxygen and carbon dioxide are
exchanged.
7. The pacemaker of the heart is the:
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale: The sinoatrial (SA) node initiates electrical impulses controlling heart
rhythm.
8. Which hormone increases blood glucose levels?
A. Insulin
B. Glucagon
C. Thyroxine
D. Aldosterone
Correct Answer: B
Rationale: Glucagon raises blood glucose by stimulating glycogen breakdown.
9. The largest organ of the human body is the:
A. Liver
B. Brain
C. Skin
D. Heart
Correct Answer: C
Rationale: The skin is the largest organ in terms of surface area.
, 10. Which blood cells are responsible for immunity?
A. Erythrocytes
B. Leukocytes
C. Thrombocytes
D. Plasma cells only
Correct Answer: B
Rationale: White blood cells (leukocytes) defend against pathogens.
11. The respiratory center is located in the:
A. Cerebrum
B. Medulla oblongata
C. Hypothalamus
D. Spinal cord
Correct Answer: B
Rationale: The medulla oblongata controls breathing rhythm.
12. The hormone that regulates water balance is:
A. Insulin
B. ADH
C. Estrogen
D. Cortisol
Correct Answer: B
Rationale: Antidiuretic hormone (ADH) controls water reabsorption in kidneys.
13. The structural and functional unit of the nervous system is the:
