The network of neurons that extends through the core of the brainstem and selects information that reaches the cerebral cortex during sleep is the

Correct Answer: C

Rationale: The reticular formation regulates arousal and filters sensory input to the cortex, influencing sleep and attention.

Correct Answer: A

Rationale: White matter in the CNS consists of myelinated axons, giving it a white appearance, distinct from PNS structures or subsystems like ANS/SNS.

Correct Answer: D

Rationale: The frontal lobe houses the primary motor cortex, controlling voluntary skeletal muscle movements.

Correct Answer: D

Rationale: Retinal ganglion cells originate in the diencephalon, specifically the optic vesicle, which forms the retina.

Correct Answer: C

Rationale: Light reduces cGMP, closing Na⁺ channels, hyperpolarizing photoreceptors by reducing cation influx.