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EXCRETORY SYSTEM

EXCRETORY SYSTEM. PP 993-998. FUNCTION. Every cell in the body produces metabolic waste. The skin , lungs , and kidneys make up this system. SKIN. Excretes water, salts, small amounts of nitrogenous wastes. LUNGS. Excretes water vapor and CO 2. KIDNEYS.

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EXCRETORY SYSTEM

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  1. EXCRETORY SYSTEM PP 993-998

  2. FUNCTION • Every cell in the body produces metabolic waste. • The skin, lungs, and kidneys make up this system.

  3. SKIN • Excretes water, salts, small amounts of nitrogenous wastes LUNGS • Excretes water vapor and CO2

  4. KIDNEYS • Formation and excretion of urine • Mostly water to keep wastes dissolved and easier to excrete EX. kidney stones

  5. FILTRATION • Blood forced into kidneys to clean out urea, wastes, excess water, and various substances in the blood stream

  6. REABSORPTION • Some substances return to blood maintain balance

  7. ELIMINATION • Urine passes through the ureters to be stored in bladder until it is secreted through the urethra

  8. URINE • Normally made of urea (from broken down proteins), water, and salt • Very light yellow color

  9. WHAT URINE TELLS US • Proteins may leak into the urine if the kidney is damaged • Too dark in color indicates dehydration • Brown color indicates bleeding from the kidneys • Urine will have a high glucose count if the individual is diabetic • Low or no glucose indicates hypoglycemia, which results from too much insulin

  10. Figure 44.19-2 Osmoreceptors inhypothalamus triggerrelease of ADH. Thirst Hypothalamus Drinking reducesblood osmolarityto set point. ADH Pituitarygland Increasedpermeability Distaltubule STIMULUS:Increase in bloodosmolarity (forinstance, aftersweating profusely) H2O reab-sorption helpsprevent furtherosmolarityincrease. Collecting duct Homeostasis:Blood osmolarity(300 mOsm/L)

  11. HOMEOSTASIS • Urine production is regulated by the antidiuretic hormone (ADH) • An increase in water in your blood triggers the release of ADH, causing your kidneys to take up more water to be excreted out

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