BIOS 242 Week 5 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 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 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 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 CNS to effectors?
A. Motor neurons
B. Sensory neurons
C. Interneurons
D. Glial cells
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 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 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 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 CNS to effectors?
A. Motor neurons
B. Sensory neurons
C. Interneurons
D. Glial cells
