What chamber of the heart is indicated in the figure?
Right atrium
Right ventricle
Left atrium
Left ventricle
The Correct Answer is D
A. Right atrium: Receives systemic venous blood (SVC/IVC), thin-walled chamber on the heart’s right side -not the thick, muscular chamber shown if the figure indicates the left ventricle.
B. Right ventricle: Pumps blood to the pulmonary trunk; its wall is thicker than an atrium but thinner than the left ventricle and sits more anteriorly -not the most muscular chamber.
C. Left atrium: Receives oxygenated blood from the pulmonary veins and sits posteriorly; it has thinner walls than the left ventricle.
D. Left ventricle: The left ventricle has the thickest muscular wall (high systemic pressure), forms the cardiac apex, and pumps blood into the aorta
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Intercalated discs: Structures that connect cardiac cells and permit coordination, but not the term for the group behavior.
B. Chordae tendineae: Tendinous cords of AV valves; unrelated to cell-unit behavior.
C. Functional syncytium: Describes cells acting together as one unit due to electrical coupling.
D. Systole: The contraction phase of the cardiac cycle, not a term for a cell collective.
Correct Answer is A
Explanation
A. To produce antibody molecules: plasma cells are differentiated B cells specialized for synthesizing and secreting antibodies.
B. To directly attack cells displaying antigens: cytotoxic T lymphocytes (and NK cells) directly attack antigen-bearing cells; plasma cells primarily secrete antibodies.
C. To increase the volume of the blood plasma: plasma cell activity does not change plasma volume; they produce proteins (antibodies), not fluid volume.
D. To produce interferon: many cell types secrete interferons in response to viral infection (e.g., infected cells, immune cells), but plasma cells are dedicated antibody producers.
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