In the brain, this surrounds the white matter.

Correct Answer: C

Rationale: Gray matter (neuronal cell bodies, dendrites) surrounds white matter (axons) in the brain’s cortex. Ganglia are PNS, and dendrites are neuron parts.

Correct Answer: A

Rationale: Synaptic ends (terminals) release neurotransmitters to signal another cell, concluding the axon’s impulse conduction. Axon conducts, dendrites receive, and cell body processes.

Correct Answer: C

Rationale: Gray matter comprises neuronal cell bodies, dendrites, and unmyelinated axons, forming CNS regions like the cortex. Myelinated axons are white matter.

Correct Answer: D

Rationale: The straight sinus is formed by the union of the inferior sagittal sinus (along the falx cerebri) and the great cerebral vein (Galen), draining into the confluence of sinuses. The superior sagittal sinus contributes to other sinuses, and the transverse sinus is downstream.

Correct Answer: D

Rationale: Neuroglia (e.g., astrocytes, oligodendrocytes) support and nourish neurons. Dendrites and axons are neuron parts, and neurotransmitters are chemicals.