In the human body, water and electrolytes move from the arterial capillary bed to the interstitial fluid. What causes this to occur?
A) The active transport of hydrogen ions across the capillary walls
B) The pressure of the blood in the renal capillaries
C) The number of dissolved particles contained in a unit of blood
D) The hydrostatic pressure resulting from the pumping action of the heart
Ans: D
Feedback: Another example of filtration is the passage of water and electrolytes from the arterial capillary bed to the interstitial fluid; in this instance, the hydrostatic pressure results from the pumping action of the heart. Active transport does not move water and electrolytes from the arterial capillary bed to the interstitial fluid, filtration does. The number of dissolved particles in a unit of blood is concerned with osmolality. The pressure in the renal capillaries causes renal filtration.
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