What type of ganglion contains neurons that control homeostatic mechanisms of the body?

Correct Answer: C

Rationale: Autonomic ganglia (C) contain neurons regulating homeostasis (e.g., heart rate, digestion) via the autonomic nervous system. Sensory (A) and dorsal root ganglia (B) handle sensation, and cranial nerve ganglia (D) vary. C is correct.

Correct Answer: C

Rationale: Chemoreceptors detect chemical stimuli, such as molecules (e.g., odors or tastes), in the environment or body. Thermoreceptors detect temperature, not light, sound, or vibration.

Correct Answer: A

Rationale: Mechanically gated channels open in response to physical stimuli, such as pressure or stretch (e.g., in touch receptors). Chemical stimuli affect ligand-gated channels.

Correct Answer: A

Rationale: GABA (gamma-aminobutyric acid) is the primary inhibitory neurotransmitter in the CNS, causing hyperpolarization. Acetylcholine, glutamate (excitatory), and norepinephrine have varied effects.

Correct Answer: D

Rationale: The medulla oblongata extends through the foramen magnum, connecting the brain to the spinal cord. It lies below the pons, not between midbrain and pons, and has multiple cranial nerves (e.g., IX, X, XII), not just trigeminal (V). Pyramids are medial to olives.