The part of the nervous system that lies outside the central nervous system, consisting of nerves and ganglia.

Correct Answer: D

Rationale: The peripheral nervous system (PNS) includes nerves and ganglia outside the CNS. Neuroblastoma is a tumor, ANS is a PNS subdivision, and action potentials are signals.

Correct Answer: C

Rationale: An axosomatic synapse occurs from an axon to a neuron’s cell body. Oligodendrocytes are glia, agonist is a drug term, and SNS is a system.

Correct Answer: A

Rationale: Purkinje cells are specialized muscle fibers in the heart’s ventricles, conducting electrical signals for contraction. GBS is a disorder, dendrites and axon terminals are neuron parts.

Correct Answer: A

Rationale: The parasympathetic nervous system (craniosacral) conserves energy, with preganglionic neurons in the brainstem and sacral cord. Agonist is a drug term, divergence is a synapse pattern, and sensory neurons are afferent.

Correct Answer: C

Rationale: Glutamate is the primary excitatory neurotransmitter in the CNS, always depolarizing postsynaptic neurons. Glycine and GABA are inhibitory, and norepinephrine has mixed effects.