A layer of smooth muscle, called the detrusor muscle gives the bladder wall its elasticity.
In the field of biology, the detrusor muscle can be defined as the involuntary muscle present in the wall of the bladder. When the detrusor muscle is relaxed, it can store urine. When the bladder fills up, the detrusor muscle contracts as a signal for releasing urine.
The detrusor muscle is made up of smooth muscles. The structure of these smooth muscles, woven together, is ideal for stretching in order to store urine.
As a person ages and become old, the detrusor muscles lack their ability to relax hence causing problems in storing urine for a patient.
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