Which structure is known as the working unit of nervous system?

Correct Answer: B

Rationale: Neurons are the fundamental units of the nervous system responsible for receiving, processing, and transmitting signals. Nerves (A) are bundles of axons, not the working unit itself. The cell body (C) is a part of a neuron, not the whole unit. Neuralgia (D) refers to nerve pain, not a structure.

Correct Answer: C

Rationale: Cones (not 'cons,' likely a typo) handle photopic (daylight) vision, not scotopic (rods do, ruling out A). Intraocular pressure is typically 10-21 mmHg (B is slightly off), myopia is corrected with concave lenses (C is correct), and the light reflex is mediated by the midbrain, not cortex (D). C is the correct answer.

Correct Answer: B

Rationale: Pyramidal (upper motor neuron) signs include hypertonia (A), upgoing toe (C, Babinski sign), and absent abdominal reflexes (D). 'Hyprflexion' (B, likely hyperreflexia typo) is not a standard term, but hyperreflexia fits; still, it’s less specific than others. B is the odd one out.

Correct Answer: C

Rationale: The knee jerk (A), ankle jerk (B), and supinator reflex (D) are monosynaptic stretch reflexes. The abdominal reflex (C) is polysynaptic, involving interneurons and cutaneous input. C is correct.

Correct Answer: C

Rationale: Pyramidal (upper motor neuron) disease causes weakness (C), spasticity, and hyperreflexia, not tremor (A, basal ganglia), wasting (B, lower motor), or hypotonia (D, cerebellar). C is correct.