The primary effect of cocaine on the nervous system is that cocaine blocks the re-uptake of:

Correct Answer: A

Rationale: Cocaine blocks monoamine reuptake (dopamine, norepinephrine, serotonin), increasing synaptic levels. 'Transamines' is a typo, catecholamine is a monoamine subset, and monoamine oxidase degrades them.

Correct Answer: C

Rationale: Ependymal cells line ventricles and the spinal canal, aiding CSF production/circulation. Astrocytes support, Schwann cells are PNS, oligodendrocytes myelinate.

Correct Answer: A

Rationale: The vagus nerve (CN X) is a mixed nerve with parasympathetic innervation to thoracic and abdominal viscera. Trigeminal (CN V) is sensory/motor for the face, accessory (CN XI) is motor, and abducens (CN VI) controls eye movement.

Correct Answer: C

Rationale: A preganglionic sympathetic fiber must synapse or pass through; it cannot terminate in the chain without synapsing. Options A, B, and D are possible pathways.

Correct Answer: C

Rationale: Sympathetic system originates thoracolumbar (T1-L2), mobilizes energy, and dilates bronchi, but bile secretion is primarily parasympathetic (digestion-related).