The hypothalamus is part of the

Correct Answer: B

Rationale: The hypothalamus is part of the endocrine system (B), regulating hormones. It’s not primarily cardiovascular (A), respiratory (C), or lymphatic (D).

Correct Answer: D

Rationale: Antibody production (D) is specific immunity. Inflammation (A), vasodilation (B), and histamine release (C) are nonspecific.

Correct Answer: C

Rationale: Rod cells handle night vision (C), unlike cones (color, A). Depth perception (B) involves both, and eye color (D) is iris pigment.

Correct Answer: D

Rationale: The zygomatic bone is the cheekbone (D). Maxilla (A) is upper jaw, jawbone (B) is mandible, and eye socket (C) is orbit.

Correct Answer: C

Rationale: Touch via skin (integumentary) sends signals to the nervous system (C). Heat (A) and nutrients (B) are indirect, and skin changes (D) are secondary.