An erection includes the sophisticated conversation of muscles, nerves, chemical substances, and blood vessels that function in coordination to engorge the penis with blood, including: [six] Erection subsides when parasympathetic stimulation is discontinued; baseline stimulation through the sympathetic division of the autonomic nervous process causes constriction of the penile arteries https://muay-thai-training-regime49371.wikidirective.com/7530289/rumored_buzz_on_penis