Which of the following selections lists conditions that would lead to increased stroke volume?

Correct Answer: C

Rationale: Increased stroke volume occurs with increased preload (more filling), decreased afterload (less resistance), and increased contractility (stronger contraction, C). Other combinations counteract.

Correct Answer: C

Rationale: The myocardium (C) is the muscular layer responsible for contraction. Endocardium (A) is inner, epicardium (B) is outer, pericardium (D) is the sac.

Correct Answer: C

Rationale: Blood temperature is ~100.4°F (A) and pH is 7.35-7.45 (B), but it’s red due to erythrocytes/hemoglobin, not leukocytes (C). Volume is ~5L (D).

Correct Answer: A

Rationale: Eosinophils (A) combat parasites and immune complexes. Monocytes (B) phagocytize broadly, lymphocytes (C) are immune, basophils (D) promote inflammation.

Correct Answer: D

Rationale: Myeloblasts (D) produce granular leukocytes (neutrophils, eosinophils, basophils). Others form RBCs (A), platelets (B), or agranulocytes (C).