BISC106 Chapter Notes - Chapter 16: Microvillus, Renin, Fluid Balance

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Excretion: elimination of wastes and excess substances from the body: metabolic wastes co2, h2o, heat, excess ions, and nitrogen- containing wastes such as ammonia, urea, uric acid, and creatine (produced during the breakdown of proteins) Lungs and skin eliminate heat, water, and co2 (and skin eliminates salts as well) Gi tract excretes solid wastes and some metabolic wastes. Urine: mix of water and solute that excretes water, excess ions, urea, uric acid, and creatine. Urinary system: 2 kidneys, 2 ureters, 1 bladder, 1 urethra: regulates volume, pressure, and composition of the blood. Kidneys: regulates the amount of water and dissolved substances that are removed from and returned to the blood: substances not returned go to the urine. Urine from the kidneys travels down muscular tubes called ureters to the bladder. The bladder stores urine and urine leaves through the urethra. Renal arteries branch off the aorta and bring blood to the kidneys.

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