Urinary system.slides

1. Arterial blood supply to the left kidney! 2. a. Excrete (get rid of) metabolic wastes in the blood by filtering them out and excreting them in urine. b. Maintain homeostasis of a. Amount of H20 b. Amount of salts c. Amount of Na+/K+ d. pH of body fluids 3. Renal cortex: contains nephrons functional unit of kidney (1 million per kidney!) Medulla: composed of renal pyramids Renal pyramids: contain collecting ducts Calyx: drain urine from each renal pyramid and into ureter 4. a. Filtration: Filtration occurs in the glomerulus. Blood pressure forces water, salt, glucose, amino acids, and urea into the glomerular capsule. Proteins and blood cells are too big to cross the membrane; they remain in the blood. The fluid that enters the renal tubules is called the filtrate. 5. a. 15 gallons b. 25 gallons c. 45 gallons d. 125 gallons 6. 125 milliliters of blood per minute 45 gallons of blood in 24 hours!!! 7. b. Reabsorption: As the filtrate flows through the renal tubule, most of the water and nutrients are reabsorbed into the blood. The concentrated fluid that enters the collecting duct is called urine. 8. c. Secretion: Some substances that were reabsorbed are secreted into the filtrate, such as certain drugs, excess potassium, or as a final way to control blood pH. 9. Know the pathway of urine from the kidneys to exterior of the body! What is the functional unit of the kidney? When is the end product of kidney function?