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Excretion of Waste

Explore the filtration, secretion, reabsorption, and excretion functions of the kidney in removing waste from the blood. Learn about the Nephron, the kidney's functional unit, and the formation of urine.

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Excretion of Waste

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  1. The Urinary System Excretion of Waste

  2. Human Urinary Tract Human urinary tract diagram

  3. Filtration and removal of metabolic wastes from the blood • Urea (nitrogen waste from proteins) • Excess Salts • Excess Water • Excess Glucose (sugar) • Excess Minerals (Na+, K+, Ca2+) The Kidney’s job:

  4. Function of the Kidney- filtration, secretion, reabsorption, excretion kidney animation

  5. Nephron- the functional unit of the kidney. Each kidney has about 1.3 million of these little filtration units!Magnified, they look like this:

  6. Filtration: materials from the blood are forced out of the glomerulus into the Bowman’s capsule (“filtrate”). • Reabsorption: some of the substances that left the blood need to be returned, for homeostasis purposes, and so are selectively diffused or actively transported out of the proximal convoluted tubule back into the capillaries • Secretion: final “tweak”. Some more wastes and H+ ions are secreted from the blood into the distal convoluted tubule Formation of Urine:

  7. Human Urinary Tract Human urinary tract diagram

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