Substances tend to leave the bloodstream at the arterial end of the capillary because ________.
A) the osmotic pressure of the blood is higher at the arterial end of the capillary
B) the osmotic pressure of the blood is higher at the venule end of the capillary
C) blood pressure is higher at the arterial end of the capillary
D) blood pressure is higher at the venule end of the capillary
E) interstitial pressure is higher at the arterial end of the capillary

Question

Quizplus · Accepted Answer

Blood pressure is higher at the arterial end of the capillary, and substances tend to leave the bloodstream at this end due to the pressure gradient. This process is called filtration. At the venule end of the capillary, blood pressure is lower, and substances tend to be reabsorbed into the bloodstream due to the higher osmotic pressure of the blood. This process is called reabsorption.

Substances Tend to Leave the Bloodstream at the Arterial End