The sympathetic nervous system will ___ contraction strength of the heart, thus leading to a(n) ___ in stroke volume.

Correct Answer: C

Rationale: Sympathetic stimulation increases contraction strength (inotropy, C) via norepinephrine, increasing stroke volume. A, B, D mismatch physiology.

Correct Answer: D

Rationale: Atrial natriuretic factor (ANF, D) decreases BP by promoting vasodilation and sodium/water excretion. A, B, C increase BP.

Correct Answer: C

Rationale: The common carotid arteries (C) deliver oxygen-rich blood to the head. Jugulars (A) and brachiocephalic (D) are veins, subclavian (B) supplies arms.

Correct Answer: D

Rationale: Chordae tendineae (D) are in the heart’s ventricles, anchoring AV valves to papillary muscles. Auricles (A) are atrial appendages, brain ventricles (B) are unrelated, and sinus venosus (C) is embryonic.

Correct Answer: A

Rationale: Angiography (A) visualizes blood vessels using contrast dye. Tomography (B) is general imaging, venography (C) is vein-specific (less broad), and electromyography (D) assesses muscles.