For erection and ejaculation to occur,
A) there must be sufficient blood hydrostatic pressure leading to erectile tissue.
B) the parasympathetic and sympathetic branches of the nervous system must be properly functioning.
C) the urinary sphincters must be closed.
D) A and B only
E) all of the above

Question

Quizplus · Accepted Answer

All of the given options are required for erection and ejaculation to occur. A sufficient blood hydrostatic pressure leads to the filling of the erectile tissue, while both parasympathetic and sympathetic branches of the nervous system must be properly functioning to coordinate the events of erection and ejaculation. Additionally, the closure of urinary sphincters is necessary to prevent urine from being mixed with semen during ejaculation.

For Erection and Ejaculation to Occur