Atrial natriuretic peptide ________ in kidneys.
A. inhibits the reabsoprtion of Na+
B. stimulates the reabsoprtion of K+ and the secretion of Na+
C. stimulates the reabsoprtion of K+
D. stimulates the reabsoprtion of Na+ and the secretion of K+
Answer: A
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The rejection of a transplanted organ by the immune system of the recipient is a result of a cell-mediated immune response, rather than antibody-mediated response. What does this indicate about the nature of the transplanted cells? From the perspective of the T cell, are the cells of the transplanted organ significantly different from virus-infected or cancerous self cells?
What will be an ideal response?
Hypercapnia and acidosis have positive chronotropic effects.
Answer the following statement true (T) or false (F)
The opening of more and more Na+ ion channels during depolarization
A. is the result of the sodium-potassium exchange pump. B. is an example of a positive feedback cycle. C. is possible only if K+ channels remain closed. D. is the cause of the afterpotential. E. is an example of a negative feedback cycle.