BIOL 1002 Chapter : Test Three
Document Summary
Urine: watery fluid, contains waste materials from cellular metabolism, and some nutrients, ions, etc, nitrogenous waste: ammonia, urea, uric acid. Helps maintain homeostasis by adjusting water content, ph, and concentrations of a variety of ions and small organic molecules in bodily fluid. Kidneys and ureters: nephron: functional unit of kidney renal refers to kidney, renal artery supplies kidney with blood from heart to be filtered, renal vein takes filtered blood and sends back to the heart, helps regulate bp. These organs filter small molecules and ions out of the blood, return essential ions and nutrients, and collect and excrete substances and cellular waste. Cortex: where urine is formed: distal tubule empties urine into collecting duct. Medulla: marrow of the kidney; contains nephrons, urine also formed here. Renal pelvis: collects urine and conducts into the ureter. Ureters: carry urine to bladder (ureter and bladder are muscular portions of system) The avg. adult bladder can hold a pint of urine.