ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
The undershoot or afterhyperpolarization phase of an action potential is mainly due to:
Correct Answer: B
Rationale: Afterhyperpolarization occurs as K+ continues exiting, overshooting rest potential. Na+ influx stops earlier, Ca2+ is synaptic, Cl- minimal.
Question 2 of 5
The paired structures within the lateral ventricles that produce cerebrospinal fluid (CSF) are known as the:
Correct Answer: B
Rationale: Choroid plexuses in ventricles produce CSF. Foramina connect, villi reabsorb, sinuses drain.
Question 3 of 5
The largest part of the human brain responsible for higher cognitive functions, such as thinking and problem-solving, is the:
Correct Answer: D
Rationale: The cerebrum handles higher functions (e.g., thinking). Cerebellum coordinates, brainstem regulates vitals.
Question 4 of 5
White matter tracts that connect the cerebral hemispheres and allow communication between them are called:
Correct Answer: C
Rationale: Commissural tracts (e.g., corpus callosum) connect hemispheres. Others serve different roles.
Question 5 of 5
The primary visual cortex, involved in visual perception, is located in the:
Correct Answer: D
Rationale: The primary visual cortex (V1) in the occipital lobe processes vision.