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BIO 210 Lab Quiz , Nervous System With Correct
Answers 2026
Question 1
Which part of the neuron is primarily responsible for receiving incoming
signals?
A. Axon
B. Dendrites
C. Axon terminal
D. Myelin sheath
Answer: B
Rationale: Dendrites are specialized to receive signals from other
neurons and transmit them toward the cell body.
Question 2
Select all that apply: Which structures are involved in speeding up nerve
impulse conduction?
A. Nodes of Ranvier
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B. Myelin sheath
C. Dendrites
D. Schwann cells
Answer: A, B, D
Rationale: Myelin sheath (produced by Schwann cells in PNS) insulates
axons, and Nodes of Ranvier allow saltatory conduction, increasing
speed.
Neuron Diagram
Action Potential
Question 3
During which phase of the action potential does sodium (Na⁺) rapidly
enter the neuron?
A. Repolarization
B. Hyperpolarization
C. Depolarization
D. Resting state
Answer: C
pg. 2
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Rationale: Depolarization occurs when voltage-gated Na⁺ channels
open, allowing Na⁺ influx.
Question 4
What is the typical resting membrane potential of a neuron?
A. +30 mV
B. -70 mV
C. 0 mV
D. -120 mV
Answer: B
Rationale: Neurons typically maintain a resting potential of about -70
mV due to ion distribution.
Action Potential Graph
: Synaptic Transmission
Question 5
Which neurotransmitter is primarily associated with muscle
contraction?
pg. 3
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A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Answer: C
Rationale: Acetylcholine is released at neuromuscular junctions to
stimulate muscle contraction.
Question 6
Select all that apply: What can happen after neurotransmitters are
released into the synaptic cleft?
A. Bind to receptors
B. Broken down by enzymes
C. Reabsorbed by presynaptic neuron
D. Converted into DNA
Answer: A, B, C
Rationale: Neurotransmitters bind receptors, are degraded, or
reuptaken. They are not converted into DNA.
pg. 4
BIO 210 Lab Quiz , Nervous System With Correct
Answers 2026
Question 1
Which part of the neuron is primarily responsible for receiving incoming
signals?
A. Axon
B. Dendrites
C. Axon terminal
D. Myelin sheath
Answer: B
Rationale: Dendrites are specialized to receive signals from other
neurons and transmit them toward the cell body.
Question 2
Select all that apply: Which structures are involved in speeding up nerve
impulse conduction?
A. Nodes of Ranvier
pg. 1
,2|Page
B. Myelin sheath
C. Dendrites
D. Schwann cells
Answer: A, B, D
Rationale: Myelin sheath (produced by Schwann cells in PNS) insulates
axons, and Nodes of Ranvier allow saltatory conduction, increasing
speed.
Neuron Diagram
Action Potential
Question 3
During which phase of the action potential does sodium (Na⁺) rapidly
enter the neuron?
A. Repolarization
B. Hyperpolarization
C. Depolarization
D. Resting state
Answer: C
pg. 2
,3|Page
Rationale: Depolarization occurs when voltage-gated Na⁺ channels
open, allowing Na⁺ influx.
Question 4
What is the typical resting membrane potential of a neuron?
A. +30 mV
B. -70 mV
C. 0 mV
D. -120 mV
Answer: B
Rationale: Neurons typically maintain a resting potential of about -70
mV due to ion distribution.
Action Potential Graph
: Synaptic Transmission
Question 5
Which neurotransmitter is primarily associated with muscle
contraction?
pg. 3
, 4|Page
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Answer: C
Rationale: Acetylcholine is released at neuromuscular junctions to
stimulate muscle contraction.
Question 6
Select all that apply: What can happen after neurotransmitters are
released into the synaptic cleft?
A. Bind to receptors
B. Broken down by enzymes
C. Reabsorbed by presynaptic neuron
D. Converted into DNA
Answer: A, B, C
Rationale: Neurotransmitters bind receptors, are degraded, or
reuptaken. They are not converted into DNA.
pg. 4
