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When you hit your head your nervous system tells your brain that you are in pain.
Mainly the head but also the neck muscles which support the head.
Actually three: the skin, nervous system and the skeletal system.
doodoo head
No
Wearing a helmet protects the head, and many of your body's systems are controlled from there.
Either face of the head is the hitting surface.
bonk
No, hitting your head with your pillow while you're sleeping has absolutely nothing at all to do with autism and there's no reason to think that it does. If you're hitting your head with your pillow in your sleep this is fairly normal.
Yes, it definitely can. If you feel sick after hitting your head, you should see a doctor.
No
There's no head on a tugo. A tugo is an acoustic guitar with no sound hole, that's played by hitting the body. It's made entirely of wood.