Is the body flaccid when knocked out?

Diaphragm

Through digestion; undigestible materials are removed from the body via the rectum and anal canal.

Because you saw his fist, knee, elbow, foot or helmet coming and you were about to squat a brick...thats the last thing your brain remembered

some people don't feel anything but some people do.

Any where its dry. Unless it specifies what part of your body its for. (Face, knees, elbows, etc.)