Ch 30.4 Excretion fill in.ppt

As waste laden blood enters the kidney through the

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As waste-laden blood enters the kidney through the renal artery , the kidney removes: - urea - excess water and minerals - other waste products. The clean, filtered blood leaves a kidney through the renal vein and returns to circulation.
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Lesson Overview Lesson Overview The Excretory System The Excretory System Excretion and the Kidneys Each kidney contains nearly a million individual processing units called nephrons. Nephrons are where impurities are filtered out, wastes are collected , and purified blood is returned to the circulation. Blood purification in the kidneys involves two distinct processes: - filtering - reabsorbtion
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Lesson Overview Lesson Overview The Excretory System The Excretory System Filtration Passing a liquid or gas through a filter to remove wastes is called filtration The filtration of blood mainly takes place in the glomerulus. - a small, but dense network of capillaries encased in the upper end of the nephron by a hollow, cup-shaped structure called bowman’s capule
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Lesson Overview Lesson Overview The Excretory System The Excretory System Filtration The material that is filtered from the blood—the filtrate – contains water, urea, glucose, salts, amino acids, and some vitamins. Large substances transported in blood, such as proteins and blood cells, are too large to pass through the capillary walls.
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Lesson Overview Lesson Overview The Excretory System The Excretory System Reabsorption Nearly all of the material removed from the blood at Bowman’s capsule makes its way back into the blood as it flows through the nephron tubules. The process by which water and dissolved substances are taken back into the blood is called reabsorption
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Lesson Overview Lesson Overview The Excretory System The Excretory System Reabsorption A number of materials: - salts - vitamins - amino acids - fatty acids - glucose are removed from the filtrate and reabsorbed by the capillaries. Water is also reabsorbed. ***In effect, the kidney first throws away nearly everything, and then takes back only what the body needs.
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Lesson Overview Lesson Overview The Excretory System The Excretory System Reabsorption A section of the nephron tubule called the loop of Henle
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  • Spring '14
  • DeanC.Bratis

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