General term for leukocytes without cytoplasmic granules

Correct Answer: B

Rationale: Agranulocytes (B) (lymphocytes, monocytes) lack granules.

Correct Answer: D

Rationale: Type AB (D) are universal recipients, accepting all ABO types.

Correct Answer: D

Rationale: Nervi vasorum are nerves in vessel walls regulating smooth muscle, controlling both vasoconstriction (A) and vasodilation (B), thus (D). Capillary permeability (C) is not nerve-controlled.

Correct Answer: B

Rationale: Coronary arteries arise from the ascending aorta (B), just above the aortic valve, supplying the heart.

Correct Answer: C

Rationale: Autorhythmicity (C) is unique to cardiac muscle (pacemaker cells). Sarcoplasmic reticulum (A), gap junctions (B), and mitochondria (D) exist in other muscles too.