Assertion: prostatic urethra | /r/HasProperty | stimulated by alpha-adrenergic neurons
Facets:
value: to contract
type: PURPOSE
Source sentences:
text: The proximal urethra is surrounded by circular smooth muscle, which is commonly referred to as the preprostatic sphincter that is the autonomic component of the control of urination and also serves to stop retrograde ejaculation into the urinary bladder, as it is stimulated by alpha-adrenergic neurons to contract during ejaculation.