Which of the following is consistent with homeostasis?
as body temperature rises, sweating occurs to cool the body
after drinking large amounts of water, urine output decreases to raise blood volume
decreases in blood pressure cause a corresponding decrease in heart rate
as blood pressure falls, blood flow to the heart decreases
The Correct Answer is A
A. As body temperature rises, sweating occurs to cool the body:
An example of negative feedback, where the body counters a change to restore normal state.
B. After drinking large amounts of water, urine output decreases to raise blood volume:
Urine output would actually increase to excrete the excess water and maintain volume.
C. Decreases in blood pressure cause a corresponding decrease in heart rate:
A decrease in blood pressure should cause the heart rate to increase (compensatory response).
D. As blood pressure falls, blood flow to the heart decreases:
The body usually increases heart rate and vasoconstriction to maintain cardiac output.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. anaphase – sister chromatids are pulled to separate ends of the cell: During anaphase, sister chromatids separate and move to opposite poles.
B. metaphase – chromosomes line up at the center of the cell: In metaphase, chromosomes align at the metaphase plate.
C. telophase – nuclear envelope is breaking down; chromosomes are condensing: In telophase, the nuclear envelope is reforming, and chromosomes are de-condensing into chromatin. The description given fits prophase, not telophase.
D. interphase – cell is going about its daily business, at the end DNA is duplicated and starts condensing: During interphase, the cell grows and replicates DNA in preparation for mitosis.
Correct Answer is B
Explanation
A. enhance changes in the pH of solutions: A buffer does the opposite-it prevents drastic pH changes.
B. resist drastic changes in the pH of solutions: Buffers help maintain stable pH by neutralizing excess acids or bases (e.g., bicarbonate buffer system in blood).
C. have no effect on the pH of solutions: Buffers do affect pH-they stabilize it.
D. make a solution more acidic: Buffers don’t always make solutions acidic; they can neutralize both acids and bases.
E. make a solution more basic: Same rationale-buffers do not push pH in one direction, they resist change.
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