Assertion : We can usually control the urge to urinate.
Reason: Urinary bladder is non-muscular and usually lacks excretion.
A.Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answers
c
there is two sphincter one is involuntary and another is voluntary
Answer:
The assertion is true but the reason is false.
Explanation:
Neural control on the process of micturition?
Micturition is defined as the action of urinating. When our urinary bladder becomes full, the nerves that innervate the urinary bladder sense the fact and send a signal to our brain which makes us feel the urge to urinate.
The urinary bladder is innervated by both the sympathetic and parasympathetic nervous systems, which are parts of the autonomic nervous system. The urinary bladder and no somatic innervations.
The urinary bladder continues into the urethra.
The junction between the trigone of the urinary bladder and the starting of the urethra is guarded by the internal sphincter, which is again under the control of the sympathetic and parasympathetic nervous systems, with no somatic control.
The urethra also possesses an external sphincter which is under the control of the somatic nervous system, i.e., we can control it under our own will.
The events which occur under the influence of the parasympathetic, sympathetic and somatic nervous system upon the urinary bladder and internal & external sphincter are given in the diagram below.
Thus it is clear that,
- When the detrusor muscles contract and both the sphincters are relaxed, then urine is flushed out of the body.
- Although we can't control the contract/relaxation of the detrusor muscle and the internal sphincters, we do have control over the external sphincter, thus allowing us to control the urge to urinate for a given period of time.
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