Test 4 Renal Flashcards
relaxed when bladder is at rest and flexed during urination
Detrusor muscle
allows the bladder to stretch
transitional epithelium
what percent of renal blood flow does renal blood flow receive
20-25 percent
The filtration of the plasma per unit of time is known as _______ which is directly related to the perfusion pressure in the glomerular
glomerular filtration rate GFR
a local mechanism that tends to keep the rate of glomerular perfusion and there for the GFR fairly constant over a range of arterial pressures between 80 and 180 mmHg
autoregulation
as arterial pressure declines, the stretch on the afferent arteriolar smooth muscle decreases and the arterial relaxes, causing an increase in glomerular perfusion, an increase in arteriolar pressure causes the arteriole smooth muscle to contract and decrease glomerular perfusion
myogenic mechanism
as the GFR in an individual nephron increases or decreases, the macula dense cells in the distal tubule sense the increasing or decreasing amounts of filtered sodium, when sodium filtration increases the macula dense cells stimulate afferent arteriolar vasoconstriction to decrease GFR
Tubuloglomerular feedback
The innervation of the kidney come primarily from the what?
celiac ganglion and greater splanchnic nerve
released during heart failure or when atrium is stretched
Inhibits renin and aldosterone
Causes a decrease in water retention
ANP
what does the proximal tube reabsorb
Na
K
what does the proximal tube secrete
H
Foreign substances
what does the distal tube reabsorb
H2O (ADH required)
what does the distal tube secrete
K Urea H NH3 some drugs
what does the collecting duct reabsorb
H20 (ADH required)
is an end product of protein metabolism and is the major constitute of urine
Can regulate pH
urea
important for diluting and concentrating urine
Epi and nore epi
catecholamines