Question

Explain how some of the components of glomerular filtration are absorbed back into the blood during urine formation

Answer 1

K+ H+ Na+ Glucose FA AA are absorbed actively and OH- Cl- and H2O are absorbed passively in PCT. Most of the water is absorbed in descending part of loop of henle and salts like NaCl are absorbed in descending part of Lopp of Henle. ADH and Aldosterone Hormones help in water and some ions reabsorption DCT and Collecting Duct

Answer 2

Explanation:

Reabsorption takes place mainly in the proximal convoluted tubule of the nephron. Nearly all of the water, glucose, potassium, and amino acids lost during glomerular filtration reenter the blood from the renal tubules. Reabsorption occurs primarily by passive transfer based on a concentration gradient, moving from a high concentration in the proximal tubule to the lower concentration in the capillaries surrounding the tubule (Figures 4-6).

A factor that greatly affects reabsorption and urinary excretion is the pH of the urine. This is especially the case with weak electrolytes. If the urine is alkaline, weak acids are more ionized and excretion is increased. Weak acids (such as glucuronide and sulfate conjugates) are less ionized if the urine is acidic and undergo reabsorption and renal excretion is reduced. Since the urinary pH varies in humans, the urinary excretion rates of weak electrolytes also vary.

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