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The Excretory System

The Excretory System. Getting rid of metabolic wastes!. Excretory System: The Function. To rid the body of wastes due to metabolic activity This is essential to maintain homeostasis. Excretory System: The Organs. SKIN : Rids body of excess water and salt (SWEAT) LUNGS : Rids body of CO 2

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The Excretory System

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  1. The Excretory System Getting rid of metabolic wastes!

  2. Excretory System: The Function • To rid the body of wastes due to metabolic activity • This is essential to maintain homeostasis

  3. Excretory System: The Organs • SKIN: • Rids body of excess water and salt (SWEAT) • LUNGS: • Rids body of CO2 • KIDNEYS: • Filter blood • Maintain blood pH • Maintain blood volume

  4. Excretory System: The Kidneys • RENAL: • Refers to anything doing with the kidneys • Kidneys involved w/ these structures: • Ureter: • Tubes that carry urine to bladder from kidneys • Urinary bladder: • Collects urine for excretion • Urethra: • Transports urine out of body from bladder

  5. Kidney Structure • Renal Artery: • Carries unfiltered (dirty) blood from heart TO kidneys • Renal Vein: • Carries filtered (clean) blood from kidneys TO heart • Renal Cortex: • Outer portion • Renal Medulla: • “Corn” shaped inner portion • Nephrons: • Functional unit of the kidneys! • Lie between cortex and medulla • Millions of them!

  6. Excretory System: The Nephron

  7. Excretory System: The Nephron • Nephrons are the functional units of the kidney • This is where filtration, pH balance, and blood volume are maintained! • Glomerulus: • Bundle of capillaries • Bowman’s Capsule: • Surround glomerulus • Loop of Henle: • Maintains water balance • Collecting Duct: • Collects wastes from filtered blood • Connected to ureter

  8. Excretory System: Nephron Process • Nephrons clean and maintain blood in 3 steps: • Filtration (filtering of blood): Glomerulus  PRESSURE  Bowman’s Capsule • Blood is filtered of water, urea, salts, and other materials • These filtered materials called FILTRATE • Reabsorption (maintaining blood volume and nutrients) • The “good” part of filtrate is reabsorbed by blood • Most filtered water re-enters blood to maintain volume • Secretion: (maintaining blood pH) • The “bad” part of filtrate is secreted back into filtrate • H+ ions, some water, salts, and urea • These together are called URINE! • Urination: Urine in Loop of Henle  Collecting Duct  Ureter  Bladder  Urethra

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