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urinary system

test 3

primary function maintains homeostasis by regulating concentrations of both water and solutes in the blood
urinary system disposes what? metabolic wastes, excess water, excess ions, toxins
urinary systems retains what? proper amount of water, proper concentrations of ions, nutrients, anythings else needed in the blood
secondary function regulates blood pressure within normal range
organs of the urinary system inferior vena cava, kidney, aorta, ureter, uterus, bladder, urethra
size of kidney mass- 150g; size- 12 cm x 6 cm x 3 cm
location of kidney located high in the abdominal cavity; posterior to the peritoneum
4 parts of the kidney capsule, cortex, medulla, pelvis
capsule external covering of dense irregular connective tissue
cortex outer solid region; consists primarily of convoluted tubules which twist many directions
medulla inner solid region; 8-12 cone shaped masses called renal pyramids, separated by renal columns; consists primarily of loops of henle and collecting ducts all oriented in the same direction
pelvis hollow medial region, extensions = calyces; connects medially with ureter
flow of blood in kidney renal artery->lobar artery->interlobar artery->arcuate artery->interlobular artery->
interlobar arteries in the cortex; send blood through afferent arterioles into groups of capillaries called glomeruli; this is where filtration occurs to begin the formation of urine
glomerulus consists of a group of interconnected capillaries; blood flows through these capillaries, plasma is filtered out, flows through a series of tubes to form urine
functions of a nephron 1) glomerular filtration 2) tubular reabsorption 3) tubular secretion 4) concentration
glomerular filtration creates a plasmalike filtrate of the blood
tubular reabsorption removes useful solutes from the filtrate, returns them to the blood
tubular secretion removes additional wastes from the blood, adds them to the filtrate
concentration removes water from the urine, concentrates wastes
hydrostatic pressure weight of water or blood pressure
osmotic pressure caused by different concentrations of solutes on different sides of a membrane; can cause movement of both solutes and water; solutes diffuse from high concentration to low; water moves from a high concentration of solutes to low
filtration holes of capillary (fenestra) stop anything large than 75 nm but let smaller molecules through; holes in basement membrane stop anything larger than 7nm; spaces between podocytes (filtration slits) stop anything larger than 30 nm
Created by: shill14



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