Which of the following brain regions is responsible for muscle coordination and tone?

Correct Answer: B

Rationale: The cerebellum coordinates muscle movement and maintains tone and balance.

Correct Answer: D

Rationale: A reflex is an involuntary, automatic response to a stimulus, often autonomic (e.g., pupil constriction).

Correct Answer: B

Rationale: The neuron is the primary structural and functional unit of the nervous system, responsible for signal transmission. Neurotransmitters are chemicals, neuroglia support, and 'nerew' is a typo for nerve.

Correct Answer: C

Rationale: Neurotransmitters (e.g., dopamine) are chemicals released at synapses for neuron communication. Hormones are endocrine, antibodies immune, and enzymes catalyze.

Correct Answer: D

Rationale: The cell body (soma) contains the nucleus and organelles, integrating signals. Axon conducts, dendrite receives, and axon hillock initiates.