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Human Sexuality

STUDY
PLAY
Physiological Process
Excitement > Plateau > Orgasm > Resolution
Sexual Stimulation
Includes hearing, sight, touch, psyche, and smell
Results in nerve transmission from the brain to the penis, affecting cyclic GMP levels in penis
Cyclic GMP
Increase blood flow in penis - swells and keeps blood from flowing out
Physiology of Erection
Stimulation increases cyclic GMP (enzyme) in penis and relaxation of smooth muscle > Increased blood flow into erectile tissue > Veins carrying blood out are shut off > Blood trapped in erectile tissue
Loss of Erection
Lack of sexual stimulation leads to breakdown of cyclic GMP (enzyme) by PDE5 (breaks down GMP and restores to normal state) > Decreased blood flow into erectile tissue > Blood no longer trapped in erectile tissue
Impotence or Erectile Dysfunction (ED)
Inability to get an erection adequate for satisfactory sexual performance
Impotence ___ with age
Increases
ED Drugs
Ex. Viagra
Allow stimulation to increase cyclic GMP by suppressing enzyme PDE5 that destroys cyclic GMP > Increased blood flow into erectile tissue > Veins carrying blood out are shut off > Blood trapped in erectile tissue