Getting rid of metabolic wastes!

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EXCRETORY SYSTEM (urinary)

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Presentation transcript:

Getting rid of metabolic wastes! 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 CO2 KIDNEYS: Filter blood Maintain blood pH Maintain blood volume

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

Kidney Structure Renal Artery: Renal Vein: Renal Cortex: 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!

Excretory System: The Nephron

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

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