BIOS 242 Week 3 Quiz Exam final (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the resting membrane potential of a typical neuron?
A. -55 mV
B. -70 mV
C. 0 mV
D. +40 mV
Correct Answer: B
Rationale: Neurons maintain ~ -70 mV due to Na⁺/K⁺ pump and ion
gradients.
2. During depolarization, which ion enters the neuron?
A. Potassium
B. Sodium
C. Calcium
D. Chloride
Correct Answer: B
Rationale: Sodium influx makes the inside of the neuron less
negative.
,3. During repolarization, which ion exits the neuron?
A. Sodium
B. Potassium
C. Calcium
D. Chloride
Correct Answer: B
Rationale: Potassium efflux restores the resting potential.
4. Which part of the neuron initiates an action potential?
A. Dendrite
B. Axon hillock
C. Soma
D. Synaptic terminal
Correct Answer: B
Rationale: Axon hillock integrates signals and fires the neuron.
5. Which glial cell forms myelin in the CNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: B
Rationale: Oligodendrocytes wrap CNS axons to increase
conduction speed.
,6. Which glial cell forms myelin in the PNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: A
Rationale: Schwann cells wrap peripheral axons.
7. Which glial cell provides structural support and forms the
blood-brain barrier?
A. Astrocytes
B. Microglia
C. Oligodendrocytes
D. Ependymal cells
Correct Answer: A
Rationale: Astrocytes maintain homeostasis and protect neurons.
8. Which glial cell acts as immune defense in the CNS?
A. Microglia
B. Astrocytes
C. Schwann cells
D. Oligodendrocytes
Correct Answer: A
Rationale: Microglia remove debris and pathogens in the CNS.
, 9. Which glial cell produces cerebrospinal fluid?
A. Ependymal cells
B. Astrocytes
C. Microglia
D. Schwann cells
Correct Answer: A
Rationale: Ependymal cells line brain ventricles.
10. Which type of neuron carries information from sensory
receptors to the CNS?
A. Sensory neurons
B. Motor neurons
C. Interneurons
D. Glial cells
Correct Answer: A
Rationale: Sensory neurons detect stimuli and transmit signals.
11. Which type of neuron carries signals from the CNS to
effectors?
A. Motor neurons
B. Sensory neurons
C. Interneurons
D. Glial cells
Correct Answer: A
Rationale: Activate muscles and glands.
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the resting membrane potential of a typical neuron?
A. -55 mV
B. -70 mV
C. 0 mV
D. +40 mV
Correct Answer: B
Rationale: Neurons maintain ~ -70 mV due to Na⁺/K⁺ pump and ion
gradients.
2. During depolarization, which ion enters the neuron?
A. Potassium
B. Sodium
C. Calcium
D. Chloride
Correct Answer: B
Rationale: Sodium influx makes the inside of the neuron less
negative.
,3. During repolarization, which ion exits the neuron?
A. Sodium
B. Potassium
C. Calcium
D. Chloride
Correct Answer: B
Rationale: Potassium efflux restores the resting potential.
4. Which part of the neuron initiates an action potential?
A. Dendrite
B. Axon hillock
C. Soma
D. Synaptic terminal
Correct Answer: B
Rationale: Axon hillock integrates signals and fires the neuron.
5. Which glial cell forms myelin in the CNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: B
Rationale: Oligodendrocytes wrap CNS axons to increase
conduction speed.
,6. Which glial cell forms myelin in the PNS?
A. Schwann cells
B. Oligodendrocytes
C. Astrocytes
D. Microglia
Correct Answer: A
Rationale: Schwann cells wrap peripheral axons.
7. Which glial cell provides structural support and forms the
blood-brain barrier?
A. Astrocytes
B. Microglia
C. Oligodendrocytes
D. Ependymal cells
Correct Answer: A
Rationale: Astrocytes maintain homeostasis and protect neurons.
8. Which glial cell acts as immune defense in the CNS?
A. Microglia
B. Astrocytes
C. Schwann cells
D. Oligodendrocytes
Correct Answer: A
Rationale: Microglia remove debris and pathogens in the CNS.
, 9. Which glial cell produces cerebrospinal fluid?
A. Ependymal cells
B. Astrocytes
C. Microglia
D. Schwann cells
Correct Answer: A
Rationale: Ependymal cells line brain ventricles.
10. Which type of neuron carries information from sensory
receptors to the CNS?
A. Sensory neurons
B. Motor neurons
C. Interneurons
D. Glial cells
Correct Answer: A
Rationale: Sensory neurons detect stimuli and transmit signals.
11. Which type of neuron carries signals from the CNS to
effectors?
A. Motor neurons
B. Sensory neurons
C. Interneurons
D. Glial cells
Correct Answer: A
Rationale: Activate muscles and glands.
