Excitement > Plateau > Orgasm > Resolution
Includes hearing, sight, touch, psyche, and smell
Results in nerve transmission from the brain to the penis, affecting cyclic GMP levels in penis
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
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
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