Bio notes 8 - Notes Topic Urinary system Biology 103 Dr...

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Topic: Urinary system Reading: Chapter 34 Main concepts : The urinary system helps maintain homeostasis in two ways: Removing nitrogenous wastes and other wastes from the blood stream. Controlling water and salt balance in the body by controlling the amount of water excreted. Other systems are involved in removing waste from the body: respiratory system (removes carbon dioxide), digestive system (evacuates solid, undigested material). Nitrogenous wastes come from the digestion of proteins: if the amino acids that make up proteins are metabolized for energy, the body removes the amine unit (NH 3 ), which is converted to urea and carried away in the blood. Parts of the urinary system: kidneys, ureters, bladder, urethra. Anatomy of the kidney: renal cortex, rental medulla, renal pelvis, nephrons. The nephrons are the basic functional unit of the kidney. Glomerulus: filtration of blood plasma into the nephron. This is driven by blood pressure, which is controlled by hormones that cause the dilation or constriction of arteries.
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