BIOS 242 Week 5 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which ion is mainly responsible for generating action
potentials?
A. Potassium
B. Sodium
C. Calcium
D. Chloride
Correct Answer: B
Rationale:Sodium influx initiates depolarization in neurons.
2. Which ion is mainly responsible for repolarization?
A. Sodium
B. Potassium
C. Calcium
D. Chloride
Correct Answer: B
Rationale:Potassium efflux restores the resting potential.
,3. Which division of nervous system controls voluntary muscles?
A. Autonomic
B. Somatic
C. Sympathetic
D. Parasympathetic
Correct Answer: B
Rationale:Somatic system controls skeletal muscles consciously.
4. Which division of nervous system controls involuntary organs?
A. Somatic
B. Autonomic
C. Central
D. Peripheral
Correct Answer: B
Rationale:Autonomic system regulates heart, glands, and smooth
muscles.
5. Which division triggers “fight or flight”?
A. Parasympathetic
B. Sympathetic
C. Somatic
D. Central
Correct Answer: B
Rationale:Sympathetic activation increases heart rate and energy
mobilization.
,6. Which division triggers “rest and digest”?
A. Sympathetic
B. Parasympathetic
C. Somatic
D. Central
Correct Answer: B
Rationale:Parasympathetic system conserves energy and slows heart
rate.
7. Which neurotransmitter is excitatory in CNS?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale:Glutamate increases neuronal firing and is critical for
learning.
8. Which neurotransmitter is inhibitory in CNS?
A. Glutamate
B. GABA
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale:GABA prevents overactivation of neurons.
, 9. Which neurotransmitter regulates mood and sleep?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Correct Answer: B
Rationale:Serotonin stabilizes mood and regulates circadian
rhythms.
10. Which neurotransmitter controls muscle contraction?
A. Acetylcholine
B. Dopamine
C. Serotonin
D. GABA
Correct Answer: A
Rationale:Released at neuromuscular junctions to activate skeletal
muscles.
11. Which cells form myelin in CNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: B
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which ion is mainly responsible for generating action
potentials?
A. Potassium
B. Sodium
C. Calcium
D. Chloride
Correct Answer: B
Rationale:Sodium influx initiates depolarization in neurons.
2. Which ion is mainly responsible for repolarization?
A. Sodium
B. Potassium
C. Calcium
D. Chloride
Correct Answer: B
Rationale:Potassium efflux restores the resting potential.
,3. Which division of nervous system controls voluntary muscles?
A. Autonomic
B. Somatic
C. Sympathetic
D. Parasympathetic
Correct Answer: B
Rationale:Somatic system controls skeletal muscles consciously.
4. Which division of nervous system controls involuntary organs?
A. Somatic
B. Autonomic
C. Central
D. Peripheral
Correct Answer: B
Rationale:Autonomic system regulates heart, glands, and smooth
muscles.
5. Which division triggers “fight or flight”?
A. Parasympathetic
B. Sympathetic
C. Somatic
D. Central
Correct Answer: B
Rationale:Sympathetic activation increases heart rate and energy
mobilization.
,6. Which division triggers “rest and digest”?
A. Sympathetic
B. Parasympathetic
C. Somatic
D. Central
Correct Answer: B
Rationale:Parasympathetic system conserves energy and slows heart
rate.
7. Which neurotransmitter is excitatory in CNS?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale:Glutamate increases neuronal firing and is critical for
learning.
8. Which neurotransmitter is inhibitory in CNS?
A. Glutamate
B. GABA
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale:GABA prevents overactivation of neurons.
, 9. Which neurotransmitter regulates mood and sleep?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Correct Answer: B
Rationale:Serotonin stabilizes mood and regulates circadian
rhythms.
10. Which neurotransmitter controls muscle contraction?
A. Acetylcholine
B. Dopamine
C. Serotonin
D. GABA
Correct Answer: A
Rationale:Released at neuromuscular junctions to activate skeletal
muscles.
11. Which cells form myelin in CNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: B
