Flashcards in Physiology of Human Sexual Response Deck (23):
In humans, learning appears to be much more important than in other species where sex is driven almost completely by hormonal exposure
The two main physiologic responses during sex in both genders:
1) Myotonia: which is increased muscle tension, it is sometimes rhythmic, oftentimes both agonist and antagonist muscles contract.
2) Vasocongestion- increased blood flow, primarily by increased influx of blood.
Is there variety in the time and extent of responses?
Four stages of sexual response
Time before you can achieve another erection (enter the excitement phase) is called
Powerful orgasm in a woman= pretty steep (fast) resolution phase
Milder orgasms = a resolution phase of lesser slope and therefore may be aroused more easily for another orgasm
Erection is mainly a ---------- reflex
PARASYMPATHETIC.....duh. (not a flight or fight response)
Blood flow to the penis during an erection increases how much?
Erection center located in what region of the spinal cord
What nerve controls vasodilation of arteries?
Increased Nitric oxide activity also plays a role in achieving an erection
Inc NO synthase-> Inc NO locally --> Inc Guanylate Cyclase --> Inc cGMP --> smooth muscle relaxation --> vasodilation --> Inc blood flow
This is what viagra does. It increase nitric oxide synthase, which increases NO locally, which increases guanylate cyclase, which increases cGMP --> Which relaxes smooth muscle and causes vasodilation. Viagra maintais cGMP
Weird dude proved that erection is what
Mainly vasodilation of the arterioles from relaxation of arteriolar smooth muscle by injecting an alpha blocker into his own penis onstage.
Plateau phase consists of calpers gland secretions, some penile engorgement and movement of testis towards the abdomen
What is priaprism
a potentially painful medical condition in which the erect penis or clitoris does not return to its flacid state
Penile erections for more than 6 hours can be classified as priaprism
A MEDICAL EMERGENCY
2 parts of ejaculation
Emission then ejaculation
Ejaculation is coordinated in which part of the spinal cord
Emission is what?
Rhythmic contractions of smooth muscle, particularly the epididymis, vas deferens, seminal vesicles and prostate INTO the prostatic urethra
KNOW the Erection, Ejaculation diagram
Nipple erection occurs in women during arousal but it is harder to see because the mammary glands increase in size as well.
vagina during excitement phase
increase in lubrication
Vagina expands and uterus moves upwards