Filtration

Materials from the blood are forced out of the glomerulus and into the Bowman's capsule during a process called filtration. Blood in the glomerulus is under relatively high pressure. This pressure forces water, urea, glucose, vitamins, and salts through the thin capillary walls of the glomerulus and into the Bowman's capsule. About one-fifth of the fluid portion of the blood filters into the Bowman's capsule. The rest remains in the capillaries, along with proteins and cells that are too large to pass through the capillary walls. In a healthy kidney, the filtrate—the fluid that enters the nephron—does not contain large protein molecules.

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www.scilinks.org Topic: Excretory System Keyword: HM60553

www.scilinks.org Topic: Excretory System Keyword: HM60553

Maintained by the f t fU ft National Science r « il A, J, Teachers Association

Maintained by the f t fU ft National Science r « il A, J, Teachers Association

figure 48-16

Color-coded arrows indicate where in the nephron the filtrate travels, and where reabsorption and secretion occur.

figure 48-16

Color-coded arrows indicate where in the nephron the filtrate travels, and where reabsorption and secretion occur.

According to data from the U.S. Environmental Protection Agency, indoor areas, where we spend up to 90 percent of our time, contain substances that may be hazardous to our health. Because of their function in excretion, kidneys often are exposed to hazardous chemicals that have entered the body through the lungs, skin, or gastrointestinal tract. Household substances that, in concentration, can damage kidneys include paint, varnishes, furniture oils, glues, aerosol

According to data from the U.S. Environmental Protection Agency, indoor areas, where we spend up to 90 percent of our time, contain substances that may be hazardous to our health. Because of their function in excretion, kidneys often are exposed to hazardous chemicals that have entered the body through the lungs, skin, or gastrointestinal tract. Household substances that, in concentration, can damage kidneys include paint, varnishes, furniture oils, glues, aerosol

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