Write an essay explaining why, for example, amino acids leave the blood through the arterial end, and organic wastes enter it via the venous end.
A capillary bed has an arterial and venous end. Exchanges of nutrients, gases, and wastes between blood and interstitial space in opposite directions occur specifically at these so-called ends. Write an essay explaining why, for example, amino acids leave the blood through the arterial end, and organic wastes enter it via the venous end.