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Chapter 17
Urinary System
29
Science
Not Applicable
12/01/2011

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Term
kidneys
Definition
filters blood
Term
ureters
Definition
transports
Term
bladder
Definition
temporary storage
Term
urethra
Definition
urine transport out of body
Term
renal artery
Definition
arise from aorta and enter kidney through hilum, branch until reach afferent arterioles that lead to nephrons.
Term
hilum
Definition
entrance for ureter, renal blood vessel, and lymphatic nerve to the kidneys
Term
cortex
Definition
light colored, granular superficial region forms renal columns
Term
medulla
Definition
exhibits cone-shaped RENAL PYRAMIDS separated by columns
Term
nephrons
Definition
two types of nephrons: cortical and juxtamedullary. they are the kidneys functional units, involved in production of concentrated urine
Term
urine formation
Definition
1. glomerular filtration
2. tubular reabsorption
3. tubular secretion
Term
micturition
Definition
control over when you pee, only reflex we have control over
Term
cortical nephrons
Definition
85% of all nephrons. located in cortex ONLY
Term
composition of urine
Definition
95% water 5% solutes
Term
renal vein
Definition
venous blood return and joins the inferior vena cava
Term
juxtamedullary nephrons
Definition
located in cortex AND medulla, have the loops of Henle that deeply invade medullao
Term
glomerulus
Definition
filtration, first step of urine formation
Term
pressure in glomerulus
Definition
very high so filtration can occure. pressure is high because when the small efferent vessels connect to the large afferent vessels the blood gets backed up.
Term
renin
Definition
regulate blood pressure
Term
angiotensin II
Definition
causes arterial pressure to rise and retention of sodium
Term
vitamin D
Definition
activated in kindey
Term
tubular reabsorption
Definition
moves h20, electrolytes, and glucose from tubular fluid to peritubular capillary
Term
tubular secretion
Definition
moves toxins, hydrogen, and ions from peritubular capillary to renal tubule
Term
what does filtrate lose to become urine?
Definition
water, nutrients, and essential ions`
Term
non reabsorbed substances
Definition
urea, uric acid, and creatinine.
Term
renal capsule
Definition
prevents kidney infection
Term
loop of henle
Definition
filtrate is diluted
Term
proximal convoluted tubule
Definition
reabsorbs water and solutes from filtrate and secretes substances into it
Term
distal convoluted tubule
Definition
secretes more substance into filtrate than it reabsorbs, cuboidal cells without microvilli.
Term
collecting ducts
Definition
impermeable to water, no wather reabsorption
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