Renal Physiology Flashcards
What are the process involved in urination?
Filling of the bladder
Micturition reflex
What is a cystometrogram?
A graph that compares intravesical pressure to the volume of urine inside the bladder
What hormone has the opposite effect of adh and aldosterone?
Atrial natriuretic peptide
What is the half life of erythropoietin?
5 hours
what is the osmolality of the fluid that leaves the DCT after the counter current mechanism has occured?
200osm
fluid at the DCT is usually …………… to blood plasma
hypotonic
at what vol of urine is the first sensation of the filling of the bladder felt? the 1st desire to urinate is felt at what volume?
100-150mL
150-250mL
what is the threshold before voluntary control of urine is lost
700ml
what nerve controls the ext urinary sphincter
pudendal n
what volume of urine initiates reflex contraction of the bladder
The volume of urine that normally initiates a reflex contraction is about 300-400 ml.
what volume of urine initiates reflex contraction of the bladder
The volume of urine that normally initiates a reflex contraction is about 300-400 ml.
what are the facilitatory and inhibitory centres for micturition?
F- pons and post hypothalamus
I- cerebral cortex and midbrain
what age does the micturition reflex begin to come under cortical control?
2.5 years
atonic bladdder is usually due to……………
loss of sensory input due to damage to sacral(parasym) fibres that provide reflex contraction when the bladder is full. so the bladder becomes fully distended and no contraction is initiated, but urine begins to drip out when the bladder is full, so then, the person can control the voluntary emptying of the bladder
in automatic bladder, there is a damage to the spinal cord above……..
the sacral region, leading to loss of voluntary control of urination
