Can you answer them with absolute right answer? 1- During the micturition reflex

Question

Can you answer them with absolute right answer?

1- During the micturition reflex,
A) the internal sphincter must be consciously relaxed before voiding urine.
B) the external sphincter must be consciously relaxed before voiding urine.
C) the internal sphincter relaxes as the result of sympathetic reflex before voiding urine.
D) the external sphincters relaxe as the result of sympathetic reflex before voiding urine.

2- (T or F) Ejaculation and emission of semen is under control of sympathetic division of the autonomic nervous system.

Explanation / Answer

Question 1

Answer is B

The external sphincter must be consciously relaxed before voiding urine

The different actions occur during the micturition reflex, are

i. The parasympathetic system that controls the detrusor muscle is an active state.

ii. The external sphincter is consciously relaxed to produce urination.

iii. Activated stretch receptors in the bladder wall send impulses to the sacral cord and to the micturition center in the brain.
iv. The internal sphincter is subconsciously relaxed

Question 2

Answer False

The ejaculation and emission of semen are controlled by the autonomic nervous system. The emission is controlled by the sympathetic nervous system at the level of T11 to L2.

The ejaculation is controlled by parasympathetic system innervated at the level of S2- S4.

So it is under control of both sympathetic and parasympathetic systems.

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