An erection involves the complex interaction of muscles, nerves, chemicals, and blood vessels that function in coordination to engorge the penis with blood, together with: Urination Urination is the discharge of urine (pee) from the body. This happens when urine passes in the bladder throughout the urethra to your meatus. https://knoxbeeca.liberty-blog.com/35623797/the-smart-trick-of-filler-for-younger-brother-that-no-one-is-discussing