ATI RN
Questions About Nervous System Questions
Question 1 of 5
The trigger for an action potential comes from potentials that develop due to the input of a stimulus to sensory receptors.
Correct Answer: A
Rationale: Graded potentials (e.g., EPSPs) in sensory receptors or dendrites, triggered by stimuli, summate to reach the threshold for an action potential. Others are not triggers.
Question 2 of 5
The gaps in between the myelin sheath are called:
Correct Answer: D
Rationale: Nodes of Ranvier are gaps between myelin segments on axons, enabling saltatory conduction. Axon, cell body, and dendrite are neuron parts.
Question 3 of 5
Identify a neuron(s) that have a multipolar structure.
Correct Answer: D
Rationale: Motor neurons and interneurons are typically multipolar (multiple processes). Sensory neurons are usually pseudounipolar.
Question 4 of 5
Which of the following accounts for the movement of neurotransmitters across a synaptic cleft?
Correct Answer: D
Rationale: Neurotransmitters move across the synaptic cleft by diffusion, driven by concentration gradients after release.
Question 5 of 5
Describe the structure of the spinal cord.
Correct Answer: C
Rationale: The spinal cord has gray matter (cell bodies) inside, surrounded by white matter (axons), with dorsal roots carrying sensory fibers.