The hormone
The Correct Answer is {"dropdown-group-1":"B","dropdown-group-2":"B"}
A. Colony-stimulating factor; negative: colony-stimulating factors (CSFs) chiefly stimulate white blood cell production, not RBCs. The feedback characterization here is not applicable to erythropoiesis.
B. Erythropoietin; positive: erythropoietin (EPO) does stimulate RBC production, but the regulatory loop is negative feedback. So labeling it “positive” is wrong.
C. Erythropoietin; negative: EPO is the hormone that stimulates RBC production and it is regulated by a negative feedback mechanism based on tissue oxygenation.
D. Colony-stimulating factor; positive: CSFs affect leukocyte lines, and erythropoiesis is not regulated by a positive-CSF loop.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Tricuspid valve
The X marks the tricuspid valve, the atrioventricular valve between the right atrium and right ventricle composed of three cusps.
Correct Answer is D
Explanation
A. Intrinsic factor: intrinsic factor is secreted by parietal cells, not produced as an inactive zymogen by chief cells.
B. mucus: mucus is secreted by mucous cells and is not an inactive enzyme precursor.
C. hydrochloric acid: HCl is secreted by parietal cells as acid, not an inactive enzyme precursor from chief cells.
D. pepsinogen: chief cells secrete pepsinogen, an inactive zymogen that is activated (to pepsin) by HCl.
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