When the first heart sound is heard, what is occurring with the heart valves?
The AV valves are closing.
The semilunar valves are closing.
The AV valves are opening.
The semilunar valves are opening.
The Correct Answer is A
A. The AV valves are closing: This occurs at S₁ (first heart sound) at the start of ventricular systole.
B. The semilunar valves are closing: Semilunar valves close at S₂ (second heart sound), not S₁.
C. The AV valves are opening: AV valves open during ventricular diastole (filling), not at S₁.
D. The semilunar valves are opening: Semilunar valves open during ventricular ejection (systole) but their opening is not what produces S₁.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The formation of a network of fibrin fibers: This describes fibrin clot formation/coagulation, not diapedesis.
B. The release of the contents of cytoplasmic granules: This is degranulation (e.g., in mast cells, neutrophils), not diapedesis.
C. The ability to rapidly divide, increasing the number of a particular leukocyte: This describes cell proliferation, not diapedesis.
D. The ability of cells to squeeze between cells of capillary walls: Diapedesis -leukocytes migrating out of the bloodstream by squeezing between endothelial cells.
Correct Answer is C
Explanation
A. Type B: Type B RBCs express B antigen, so “no A and no B” would not be type B.
B. Type A: Type A RBCs express A antigen, so not correct here.
C. Type O: Type O RBCs lack both A and B antigens (so they are “no A, no B”).
D. Type AB: Type AB RBCs express both A and B antigens, opposite of “no A and no B.”
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