The primary function of Schwann cells in the perip

ATI LPN

ATI LPN Test Bank

The primary function of Schwann cells in the peripheral nervous system is to:

A. Produce myelin sheaths around axons B. Regulate the blood-brain barrier C. Act as phagocytes D. Produce cerebrospinal fluid

Correct Answer: A

Rationale: Schwann cells myelinate PNS axons, speeding conduction. [Level: Knowledge]

White matter tracts that connect the cerebral hemispheres and allow communication between them are called:

A. Projection tracts B. Association tracts C. Commissural tracts D. Relay tracts

Correct Answer: C

Rationale: Commissural tracts (e.g., corpus callosum) connect the two cerebral hemispheres. [Level: Knowledge]

The hypothalamus plays a crucial role in:

A. Temperature regulation, hunger, and thirst B. Voluntary muscle control C. Auditory processing D. Visual perception

Correct Answer: A

Rationale: The hypothalamus regulates homeostasis (temperature, hunger, thirst). Others are unrelated. [Level: Knowledge]

White matter in the spinal cord primarily contains:

A. Cell bodies and dendrites B. Myelinated axons C. Unmyelinated axons D. Synaptic terminals

Correct Answer: B

Rationale: White matter consists of myelinated axons forming tracts. [Level: Knowledge]

Upper Motor Neurons from the motor cortex synapse with Lower Motor Neurons in the:

A. Dorsal horn B. Ventral horn C. Grey commissure D. Lateral horn

Correct Answer: B

Rationale: UMNs synapse with LMNs in the ventral horn for motor output. [Level: Knowledge]

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