Formation of urine
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What does the urine contain?
All the substances that the body does not want
What is the filtrate flows from the collecting duct called?
Urine
Is the composition, amount and colour of urine constant?
Not constant
What is the composition, amount and colour of urine affected by?
Diet, exercise, volume of liquid is drunk, health
How much litres of urine are produced daily?
1,0 - 1,5 litres
How much percent of urine is water?
96%
How much percent of urine is salts?
1,5%
How much percent of urine is urea?
2%
What else occurs in the urine?
Uric acid, creatinine, ammonium ions, drugs, colourants and preservatives
From the collecting duct where does the urine passed through next?
Passes into the renal calyx then into the renal pelvis
How is the year in propound along the ureters to the bladder?
Peristaltic movement - muscular walls
How long is the urine stored in the bladder?
Until it can be expelled through urethra
What is the expulsion of urine from the bladder called?
Urination or microturtion
How much urine can the bladder hold?
200ml - hold more double
Why is urination a reflex action?
Triggered by the filling of the Baddow
What does the impulses from the atomic nervous system stimulate the bladder muscles to do you?
Contract and the internal sphincter to relax
What happens when the internal sphincter relax?
External sphincter opens voluntarily