Which describes the effect of the sympathetic system on the eye pupil and the intestinal tract?

Correct Answer: A

Rationale: Sympathetic activation dilates pupils (via radial muscle) and inhibits intestinal motility (fight-or-flight). Parasympathetic constricts pupils and stimulates digestion.

Correct Answer: D

Rationale: The ANS regulates involuntary visceral functions, not conscious motor control (somatic nervous system). Other options are ANS roles.

Correct Answer: C

Rationale: The knee jerk is a monosynaptic spinal reflex with its center in the spinal cord (L2-L4), not conditioned or polysynaptic.

Correct Answer: D

Rationale: Impulse speed depends on fiber diameter, myelination (including Schwann cells in PNS), and physiological condition (e.g., ion channels). Length affects total time, not speed (m/s).

Correct Answer: C

Rationale: Cholinesterase (acetylcholinesterase) breaks down acetylcholine in the synaptic cleft. Epinephrine is a neurotransmitter, ‘acetylcholinase’ is not a real enzyme.