ATI RN
Questions About Nervous System Questions
Question 1 of 5
When a person jerks his hand away from a hot stove, the movement is directly stimulated by
Correct Answer: A
Rationale: Jerking away from a hot stove is a spinal reflex (e.g., withdrawal reflex), mediated by sensory neurons, interneurons, and motor neurons in the spinal cord, bypassing higher brain centers for speed.
Question 2 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 3 of 5
The stomach and the small intestine are served by the
Correct Answer: C
Rationale: The enteric nervous system (PNS) autonomously controls stomach and intestine function. CNS integrates, cranial nerves serve head, and somatic neurons control skeletal muscles.
Question 4 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 5 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.