The circulatory route from aorta to the venae cavae is the circuit

Correct Answer: B

Rationale: The systemic circuit runs from the aorta to tissues, returning via venae cavae. 'Systemic,' is correct, per physiology (e.g., Tortora). 'Pulmonary,' is heart-to-lungs. 'Circulus arteriosus,' is incorrect (likely Circle of Willis). Choice D is wrong as only systemic fits. B's accuracy makes it the answer.

Correct Answer: B

Rationale: The vulva encompasses all external female genitalia, including labia, clitoris, and vaginal opening. 'Vulva,' is correct, per gynecological anatomy (e.g., Gray's Anatomy). 'Vagina,' is internal. 'Clitoris,' and 'Labia,' are vulval parts, not the whole. Vulva's comprehensive term distinguishes B as the precise answer, anatomically accurate.

Correct Answer: B

Rationale: Antidiuretic hormone (ADH) increases water reabsorption in the kidney's collecting ducts, concentrating urine. 'Antidiuretic hormone,' is correct, per physiology texts like Costanzo, acting via aquaporins. 'Aldosterone,' reabsorbs sodium, indirectly affecting water. 'Atrial natriuretic peptide,' promotes water loss. 'Adrenaline,' affects circulation, not reabsorption. ADH's direct water retention role makes B the precise answer.

Correct Answer: C

Rationale: The respiratory center, controlling breathing, is in the medulla oblongata. 'Medulla oblongata,' is correct, per physiology (e.g., Costanzo), with rhythm and depth regulation. 'Cerebrum,' handles cognition. 'Cerebellum,' coordinates movement. 'Hypothalamus,' regulates homeostasis, not breathing directly. The medulla's role makes C the accurate answer.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.