Nervous system effector cells

Correct Answer: C

Rationale: Effector cells respond to nervous system signals; muscle cells contract and gland cells secrete, executing motor outputs, unlike sensory cells which detect stimuli.

Correct Answer: B

Rationale: The blood-brain barrier regulates the brain’s chemical environment, protecting it from fluctuations; ventricles contain cerebrospinal fluid, not interstitial fluid.

Correct Answer: A

Rationale: The thalamus acts as a relay station, sorting and directing sensory inputs like touch to the appropriate cortical areas.

Correct Answer: C

Rationale: Parkinson’s is a motor disorder (tremors, rigidity) due to dopamine neuron loss in the substantia nigra, not cerebellum.

Correct Answer: C

Rationale: Schwann cells are neuroglia in the PNS that myelinate axons, whereas astrocytes, microglia, ependymal cells, and oligodendrocytes are CNS neuroglia.