Where does most of the
water resorbed after
glomerular filtration go? What
are the other substances
resorbed by the nephron
tubules?
The urinary system in mammals is composed of paired kidneys and ureters, a urinary bladder, and a urethra. The main function of the urinary system is to produce urine and eliminate waste materials outside the body. The urinary system consists of different structures that help in producing, storing, and excreting urine from the body.
Glomerular filtration which is also known as ultrafiltration occurs when water and some dissolved substances in the blood plasma move out by passive transport through the glomerulus into the capsular space of the renal corpuscle. Pressure differences across the filtration membrane, move these substances. This fluid is called filtrate, which is a protein-free plasma. Proteins cannot pass through the capillary wall, due to their large molecular weight.
Tubular reabsorption is the process in which substances in the filtrate move by diffusion or active transport across the wall of the renal tubules and reabsorbed into the blood. The filtrate is now called the tubular fluid. During this process, all the required substances and most water that formed the filtrate are reabsorbed into the blood.
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