BIOS 252 WEEK 7 COMPREHENSIVE EXAM
2026/2027 CHAMBERLAIN UNIVERSITY
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS!!
<LATEST VERSION>
1. Which structure is primarily responsible for initiating the electrical impulse
that sets the pace of the heart?
A. Atrioventricular (AV) node
B. Purkinje fibers
C. Sinoatrial (SA) node
D. Bundle branches
Correct Answer: C
Rationale: The SA node is the natural pacemaker of the heart, initiating electrical
impulses that determine heart rate.
2. A patient with damage to the myelin sheath would most likely experience
which effect on nerve conduction?
A. Faster action potential propagation
B. Increased neurotransmitter release
C. Slower impulse transmission
D. Complete cessation of neural signaling
,Correct Answer: C
Rationale: Myelin increases conduction velocity; damage results in slower
impulse transmission due to loss of saltatory conduction.
3. Which hormone directly increases blood calcium levels?
A. Calcitonin
B. Parathyroid hormone (PTH)
C. Aldosterone
D. Thyroxine
Correct Answer: B
Rationale: PTH raises blood calcium by increasing bone resorption, renal
reabsorption, and intestinal absorption via vitamin D activation.
4. During inspiration, which physiological change occurs?
A. Thoracic volume decreases
B. Intrapulmonary pressure increases
C. Diaphragm contracts and moves downward
D. Elastic recoil of lungs forces air out
Correct Answer: C
Rationale: Contraction of the diaphragm increases thoracic volume, lowering
pressure and allowing air to flow into the lungs.
5. Which component of blood is primarily responsible for clot formation?
A. Erythrocytes
B. Leukocytes
C. Platelets
D. Plasma proteins
Correct Answer: C
Rationale: Platelets aggregate at injury sites and initiate the clotting cascade.
,6. A decrease in blood pH would stimulate which response?
A. Reduced respiratory rate
B. Increased ventilation
C. Decreased hydrogen ion excretion
D. Reduced bicarbonate production
Correct Answer: B
Rationale: Increased ventilation removes CO₂, reducing acidity and helping
restore normal pH.
7. Which structure filters blood to form urine?
A. Loop of Henle
B. Collecting duct
C. Glomerulus
D. Renal pelvis
Correct Answer: C
Rationale: The glomerulus performs filtration, allowing water and small solutes to
pass into the nephron.
8. Damage to the cerebellum would most likely result in:
A. Loss of consciousness
B. Impaired coordination and balance
C. Inability to regulate body temperature
D. Loss of sensory perception
Correct Answer: B
Rationale: The cerebellum coordinates voluntary movements, posture, and
balance.
, 9. Which leukocyte is most involved in allergic reactions?
A. Neutrophils
B. Basophils
C. Monocytes
D. Lymphocytes
Correct Answer: B
Rationale: Basophils release histamine and play a role in inflammatory and
allergic responses.
10. What is the primary function of the large intestine?
A. Nutrient absorption
B. Enzyme secretion
C. Water and electrolyte absorption
D. Protein digestion
Correct Answer: C
Rationale: The large intestine absorbs water and electrolytes, forming feces.
11. A hormone that acts on a distant target tissue is classified as:
A. Autocrine
B. Paracrine
C. Endocrine
D. Juxtacrine
Correct Answer: C
Rationale: Endocrine hormones travel through the bloodstream to act on distant
target cells.
2026/2027 CHAMBERLAIN UNIVERSITY
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS!!
<LATEST VERSION>
1. Which structure is primarily responsible for initiating the electrical impulse
that sets the pace of the heart?
A. Atrioventricular (AV) node
B. Purkinje fibers
C. Sinoatrial (SA) node
D. Bundle branches
Correct Answer: C
Rationale: The SA node is the natural pacemaker of the heart, initiating electrical
impulses that determine heart rate.
2. A patient with damage to the myelin sheath would most likely experience
which effect on nerve conduction?
A. Faster action potential propagation
B. Increased neurotransmitter release
C. Slower impulse transmission
D. Complete cessation of neural signaling
,Correct Answer: C
Rationale: Myelin increases conduction velocity; damage results in slower
impulse transmission due to loss of saltatory conduction.
3. Which hormone directly increases blood calcium levels?
A. Calcitonin
B. Parathyroid hormone (PTH)
C. Aldosterone
D. Thyroxine
Correct Answer: B
Rationale: PTH raises blood calcium by increasing bone resorption, renal
reabsorption, and intestinal absorption via vitamin D activation.
4. During inspiration, which physiological change occurs?
A. Thoracic volume decreases
B. Intrapulmonary pressure increases
C. Diaphragm contracts and moves downward
D. Elastic recoil of lungs forces air out
Correct Answer: C
Rationale: Contraction of the diaphragm increases thoracic volume, lowering
pressure and allowing air to flow into the lungs.
5. Which component of blood is primarily responsible for clot formation?
A. Erythrocytes
B. Leukocytes
C. Platelets
D. Plasma proteins
Correct Answer: C
Rationale: Platelets aggregate at injury sites and initiate the clotting cascade.
,6. A decrease in blood pH would stimulate which response?
A. Reduced respiratory rate
B. Increased ventilation
C. Decreased hydrogen ion excretion
D. Reduced bicarbonate production
Correct Answer: B
Rationale: Increased ventilation removes CO₂, reducing acidity and helping
restore normal pH.
7. Which structure filters blood to form urine?
A. Loop of Henle
B. Collecting duct
C. Glomerulus
D. Renal pelvis
Correct Answer: C
Rationale: The glomerulus performs filtration, allowing water and small solutes to
pass into the nephron.
8. Damage to the cerebellum would most likely result in:
A. Loss of consciousness
B. Impaired coordination and balance
C. Inability to regulate body temperature
D. Loss of sensory perception
Correct Answer: B
Rationale: The cerebellum coordinates voluntary movements, posture, and
balance.
, 9. Which leukocyte is most involved in allergic reactions?
A. Neutrophils
B. Basophils
C. Monocytes
D. Lymphocytes
Correct Answer: B
Rationale: Basophils release histamine and play a role in inflammatory and
allergic responses.
10. What is the primary function of the large intestine?
A. Nutrient absorption
B. Enzyme secretion
C. Water and electrolyte absorption
D. Protein digestion
Correct Answer: C
Rationale: The large intestine absorbs water and electrolytes, forming feces.
11. A hormone that acts on a distant target tissue is classified as:
A. Autocrine
B. Paracrine
C. Endocrine
D. Juxtacrine
Correct Answer: C
Rationale: Endocrine hormones travel through the bloodstream to act on distant
target cells.
