ATI RN
Questions About the Nervous System Questions
Question 1 of 5
The primary motor cortex, responsible for the voluntary control of skeletal muscles, is located in the:
Correct Answer: A
Rationale: The primary motor cortex (precentral gyrus) in the frontal lobe controls skeletal muscles.
Question 2 of 5
The dorsal root of a spinal nerve primarily contains:
Correct Answer: A
Rationale: Dorsal roots carry sensory (afferent) fibers to the CNS.
Question 3 of 5
The cervical plexus is formed by the spinal nerves from which spinal levels?
Correct Answer: A
Rationale: The cervical plexus arises from C1-C4, serving neck and diaphragm.
Question 4 of 5
Which of the following amino acids can function as a neurotransmitter in the CNS?
Correct Answer: B
Rationale: Glutamic acid (glutamate) is the primary excitatory neurotransmitter in the CNS. Leucine, lysine, and valine are not neurotransmitters.
Question 5 of 5
Which of the following toxins blocks Sodium Channels?
Correct Answer: C
Rationale: Tetrodotoxin (from pufferfish) blocks voltage-gated Na+ channels, halting action potentials. Strychnine blocks glycine, neostigmine inhibits acetylcholinesterase, curare blocks nicotinic receptors.