The labia majora in the female are homologous to the scrotum in the male.

Correct Answer: A

Rationale: True (A): Labia majora and scrotum share embryonic origin. False (B) is incorrect.

Correct Answer: B

Rationale: False (B): Vestibular glands lubricate, not regulate pH (seminal fluid and vaginal flora do). True (A) is incorrect.

Correct Answer: D

Rationale: Trachea and bronchi have cartilage (A), ciliated epithelium (B), and goblet cells (C), but not simple squamous epithelium (D), which is in alveoli.

Correct Answer: C

Rationale: Peripheral chemoreceptors are in aortic and carotid bodies (C), sensing blood gases. Lungs (A), brain (B), and heart (D) have other roles.

Correct Answer: C

Rationale: External intercostals and diaphragm (C) expand the chest for inspiration. Internal intercostals (A, D) aid expiration, abdominals (B) assist forced expiration.