Functions Of Urinay Bladder The primary function of the excretory organ is to act as a reservoir for the short time storage of excretory fluid received from the kidneys. It also controls the flow of urine with the help of check valves that prevent the unwanted forward or backward flow. As increasing volume of urine extends the smooth muscle walls, you feel a desire to urinate as soon as possible. The stretched walls send signals to the parasympathetic nervous system where a response is generated and results in the contraction of detrusor muscles to push urine out of the bladder. To start the process of urination, two regulatory sphincters, located on the way, need to be opened simultaneously. One of the sphincters is under your voluntary command, while the other is controlled by autonomous nervous system. The normal urine holding capacity of the urinary sac varies from 300 ml to about 350 ml, but with full dilation, it can hold up to 600 ml of excretory fluid! It means, the volume is increased almost twice on the attainment of its full distension. However, as soon as 150 ml of fluid is collected, a mild desire to urinate is induced in the individual but it can be delayed for a specific duration till the bladder has reached its maximum capacity.
Posted on: Wed, 24 Jul 2013 12:16:35 +0000
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