Which of the following kidney functions contributes to the production of red blood cells?
Releasing stored bicarbonate
Producing and secreting erythropoietin
Stimulating conversion of angiotensinogen
Activating vitamin D
The Correct Answer is B
a. Releasing stored bicarbonate: This function helps regulate acid-base balance but is not related to red blood cell production.
b. Producing and secreting erythropoietin: The kidneys produce and release erythropoietin, a hormone that stimulates red blood cell production in the bone marrow.
c. Stimulating conversion of angiotensinogen: This is part of the renin-angiotensin system, which regulates blood pressure and fluid balance, not red blood cell production.
d. Activating vitamin D: This function helps in calcium and phosphate metabolism but is not directly involved in red blood cell production.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Destroy pathogens that enter a break in the skin: While mast cells can contribute to the defense against pathogens by releasing inflammatory mediators, their primary function is not the direct destruction of pathogens.
b. Produce histamine and leukotrienes that initiate inflammation: This is correct. Mast cells are known for their role in releasing histamine and leukotrienes, which are key mediators of the inflammatory response.
c. Cushion bony prominences: This is not a function of mast cells. Cushioning bony prominences is a role more related to adipose tissue.
d. Connect skin to muscles: This is the function of connective tissue, not mast cells.
Correct Answer is A
Explanation
a. The volume of the cell decreases: When a red blood cell is placed in a hypertonic solution (solution with a higher concentration of solutes outside the cell compared to inside), water will move out of the cell through osmosis to equalize the concentration on both sides of the cell membrane. This movement of water causes the red blood cell to shrink (crenate).
b. The permeability of the cell membrane decreases: Incorrect. The permeability of the cell membrane to water remains relatively constant.
c. The permeability of the cell membrane increases: Incorrect. Osmosis is a passive process that doesn't require increased permeability.
d. The volume of the cell increases: Incorrect. A hypertonic solution will cause the cell to lose water and shrink.
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