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Card 6 / 15:
A patient arrives at the emergency department with dangerously low blood pressure. The patient’s blood colloid osmotic pressure is normal. How would you expect this situation to affect the patient’s net filtration pressure?
The patient’s blood would flow more sluggishly from the arteriole into the capillary bed. Thus, the patient’s capillary hydrostatic pressure would be below the normal 35 mm Hg at the arterial end. At the same time, the patient’s blood colloidal osmotic pressure is normal—about 25 mm Hg. Thus, even at the arterial end of the capillary bed, the net filtration pressure would be below 10 mm Hg, and an abnormally reduced level of filtration would occur. In fact, reabsorption might begin to occur by the midpoint of the capillary bed.
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