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Do Now

Do Now. What do your kidneys do? What is excreted in urine? Explain the pathway of urine starting in the kidneys. Excretory System. URINE for a real treat!! . Objectives. To identify the organs of the urinary system. To explain the major functions of the urinary system.

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Do Now

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  1. Do Now • What do your kidneys do? • What is excreted in urine? • Explain the pathway of urine starting in the kidneys.

  2. Excretory System URINE for a real treat!!

  3. Objectives • To identify the organs of the urinary system. • To explain the major functions of the urinary system. • To explain the structure of the kidney and filtration system.

  4. The Excretory System • Functions: • Removes certain salts and nitrogenous wastes from blood • Maintains water and electrolyte concentrations • Regulates pH and volume of body fluids • Helps control RBC production and blood pressure

  5. Major Organs and Functions • Kidneys: removes substances from blood, form urine, regulate metabolic processes. • Ureters: transports urine from the kidneys to the bladder. • Urinary Bladder: stores urine • Tubular Urethra: excretes urine to the outside of the body.

  6. The Kidney… Where it all happens = KIDNEY

  7. Lets take a look…

  8. Nephrons! • Glomerulus filters blood  • glomerular capsule receives filtrate  • travels through proximal convoluted tubule and into loop of Henle (descending and ascending portions) • travels through distal convoluted tubule • merges in renal cortex to form “collecting duct” • empties into minor and then major calyxes • empties into the renal pelvis  • passes into the ureter! Phew that was long. Nephron Physiology

  9. Urine Composition • Approx 95% water!! • Urea: by-product of amino acid catabolism (allows us to determine amt. of protein in diet!) • Uric Acid: product of metabolism of certain organic bases • Electrolytes: vary with diet • Interesting Fact!: you produce between 0.6-2.5 liters per day!

  10. Micturition • Aka… urination • Distension of bladder triggers stretch receptors, generating a sensory impulse to the brain which triggers a motor impulse to the detrusor muscle, which contracts the bladder! • Release is controlled by the external urethral sphincter which is voluntary.

  11. Labeling

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