ATI RN
Autonomic Nervous System NCLEX Questions Questions
Question 1 of 5
The threshold potential is the membrane potential at which:
Correct Answer: A
Rationale: Threshold (~-55 mV) is the potential where Na+ channels open fully, triggering an action potential. Rest is ~-70 mV, hyperpolarization follows.
Question 2 of 5
The third ventricle is a midline cavity within the diencephalon and is connected to the fourth ventricle by the:
Correct Answer: B
Rationale: The aqueduct of Sylvius links the third and fourth ventricles. Foramen of Monro is lateral-third, canal is spinal, magnum is exit.
Question 3 of 5
The total volume of cerebrospinal fluid in the human central nervous system at any given time is approximately:
Correct Answer: B
Rationale: CSF volume is ~150 mL, with 500 mL produced daily. 50 mL is too low, 1 L excessive.
Question 4 of 5
Cerebral tracts that carry information from the cerebrum to the lower parts of the central nervous system are known as:
Correct Answer: B
Rationale: Projection tracts (e.g., corticospinal) carry signals from cerebrum to lower CNS. Others connect differently.
Question 5 of 5
The basal nuclei, part of the motor system, are involved in the initiation and control of:
Correct Answer: A
Rationale: Basal nuclei (ganglia) initiate and refine voluntary movements.