QuestionSBA
QuestionChoice
This statement is true.
10006721
a
Stimulation to the pelvic nerve causes a release of ACh, which works on M3 muscarinic ACh receptors on the detrusor muscle
QuestionChoice
Neurons of the pontine micturition centre excite the sacral preganglionic neurons. This centre inhibits Onuf’s nucleus which leads to a reduction in sympathetic stimulation to the internal urethral sphincter causing relaxation.
10006722
b
Neurons of Onuf’s nucleus excite the sacral preganglionic neurons
QuestionChoice
Detrusor muscle contraction causes a conscious reduction in voluntary contraction of the external urethral sphincter from the cerebral cortex, allowing for distention of the urethra and the passing of urine.
10006725
e
A sub-conscious reduction in voluntary contraction of the internal urethral sphincter from the cerebral cortex allows for distention of the urethra and the passing of urine
QuestionChoice
The sacral preganglionic neurones cause parasympathetic stimulation to the pelvic nerve (S2-S4). Passing urine is under parasympathetic control.
10006723
c
The sacral preganglionic neurons cause sympathetic stimulation to the pelvic nerve
QuestionChoice
The pelvic nerve causes detrusor muscle contraction which leads to micturition.
10006724
d
Detrusor muscle relaxation leads to micturition
Concept
Chapter
2693
4538
Micturition reflex
Topic
168
Renal Physiology
13891
Which of the following is true with regards to the process of micturition?
a