Urinary System.docx - Urinary System Urinary system...

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Urinary SystemUrinary system- eliminates excess substances while preserving substances needed by body to functionConsists of kidneys, urinary ducts, bladderkidney- filter blood produce urineoexcrete nitrogenous wastes- creatinine, uric acid, ureaowater balance/blood volume (secrete epo + renin)oelectrolyte balance omodifying/deactivating medsourine has pH of 6- inhibit pathogenstoo high= UTIblood cells + proteins should never be filtered!!!!!!!If there is = kidney damageGlucose should be reabsorbed, none in urineIf there is = blood sugar too high (diabetes)ureter- transports urinebladder- stores urineurethra- conducts urine ORGANS OF URINARY SYSTEMKidneys- maintains water, electrolyte, and acid base balanceoFilters waste from bloodto produce urineoRetroperitoneal- lie b/w dorsal wall and peritoneum instead of inside cavity oMaintain homeostasis- kidneys make sure u excrete right amount of sodium and chloride ions to make sure u don’t have high bpRenal arteries- branch off the abdominal aortaoSend blood to kidneys from abdominal aorta
Segmental arteries (5)- branchfrom renal arteriesInterlobar arteries (b/w kidneylobes, 10)- branch fromsegmental arteriesArcuate arteries- arch on top ofeach lobeCortical radiate arteries-radiate out in cortex of kidneysAfferent arterioles- branch fromcortical radiate arteriesoConstrict during fight orflightoReduce blood flow andfiltering in kidneyoRaise BPGlomerulus capillary bed- site of filtration Efferent arterioleoBranch into peritubularcapillaries and vasa rectaoBlood that isn’t filtered atglomerulus come herePeritubular capillary bed + vasarectaoMerge and becomecontinuous w corticalradiate veinsRenal venules then to dif veins and to vena cavaRenal vein- carries blood from kidney to inferior vena cavaUreters- carry urine fromeach kidney to urinary bladderUrinary bladder- stores urineuntil it is eliminated Urethra- carries urine to outsideof bodyKidney HormonesADH- increases fluid reabsorption, odecreases urine outputoincrease blood volumeincrease BPAldosterone- increases Na+reabsorption oWater followsoIncrease blood volume KIDNEYSBean shaped structures found at back ofabdominal cavity under diaphragm
Make urine by filtering wastes and extra water from blood3 layersoRenal cortex-dense outer portion of kidneyoRenal medulla- inner portionof kidneySecrete urine into tiny sac like tubulesoRenal pelvis (innermost)- where nephrons enterSurrounded by smooth muscle uses peristalsis to move urine out of kidney into ureter and to bladderRenal pyramid- triangular shapedstriped structures making up bulk of renal medullaRenal columns- columns of solid looking tissue b/w renal pyramidsRenal papilla- tip of renal pyramidodrains urineinto minor calyxowhere collecting ducts come togetherMinor calyx-cup shaped structure encasing renal papillaoreceives urine from renal papillaocollecting ducts dump urine into hereMajor calyx- receive urine

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