ATI RN
Questions About Nervous System Questions
Question 1 of 5
A motor neuron that stimulates the hamstring muscle group is which type of neuron?
Correct Answer: A
Rationale: A motor neuron stimulating the hamstring is a peripheral neuron (lower motor neuron in the PNS), directly innervating muscles. Central neurons are CNS, basal nuclei are brain structures, and interneurons connect neurons.
Question 2 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 3 of 5
The sensory innervation to the lower part of the medial surface of the auricle is by the
Correct Answer: C
Rationale: The greater auricular nerve (C2-C3, cervical plexus) provides sensory innervation to the lower medial surface of the auricle (ear). The facial nerve (CN VII) is primarily motor, the auriculotemporal nerve (CN V3) supplies the upper lateral auricle, and the lesser occipital nerve (C2) innervates the upper posterior scalp and auricle.
Question 4 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 5 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.