Micturition is a reflex process but under some voluntary control??? What does this mean??
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Micturition refers to the process by which urine is released into the bladder from the kidneys and finally out of the body.
The statements means that urination can occur without conscious control but at the same time it can be controlled voluntarily. This is true because in normal physiology micturition involves both voluntary and involuntary actions. This is due to the innervation of the muscles of the urinary and the sphincters of the urinary bladder.
The involuntary reflex:
This is due to the fact that the internal sphincter muscles of the urinary bladder and the smooth muscles of the bladder wall being innervated by the autonomic nervous system. During storage of urine, the sympathetic nervous system ensures that the detrusor muscles remain relaxed while the internal sphincter muscles is contracted. This happens involuntarily. During micturition, the parasympathetic nervous system initiates the contraction of the detrusor muscles and the relaxation of the internal sphincter muscles- this leading to urination and it still happens involuntarily.
The voluntary action:
The external sphincter muscles, however, are under somatic innervation. This means that it can be controlled voluntarily by the central nervous system. This is why voiding(emptying of the bladder) can be initiated even when an individual is not feeling 'pressed' .
The statements means that urination can occur without conscious control but at the same time it can be controlled voluntarily. This is true because in normal physiology micturition involves both voluntary and involuntary actions. This is due to the innervation of the muscles of the urinary and the sphincters of the urinary bladder.
The involuntary reflex:
This is due to the fact that the internal sphincter muscles of the urinary bladder and the smooth muscles of the bladder wall being innervated by the autonomic nervous system. During storage of urine, the sympathetic nervous system ensures that the detrusor muscles remain relaxed while the internal sphincter muscles is contracted. This happens involuntarily. During micturition, the parasympathetic nervous system initiates the contraction of the detrusor muscles and the relaxation of the internal sphincter muscles- this leading to urination and it still happens involuntarily.
The voluntary action:
The external sphincter muscles, however, are under somatic innervation. This means that it can be controlled voluntarily by the central nervous system. This is why voiding(emptying of the bladder) can be initiated even when an individual is not feeling 'pressed' .
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