You can move your head it really doesnt effect the healing of the collar bone. I mean yes if you want you can rest you neck mucles. you can but personaly I dont think it makes a difference. But mostly you need to the rest the whole arm because if you dont, your arm will cause tention on your collar bone. I would suggest a sling of some sort.
There are over 200 bones in the human skeleton and all have muscles attached to them so you need to specify which bone.
A break
It depends. If you want a doctor to crack it so its straight again then you will need a cast after that.
Ask the doctor. But I think it's when the bone has come slightly out of place. Like when you need to click your thumbs..
No. A broken bone will hamper your moves.
Muscles,tendons,and bones are related because tendons connect muscle to bone and ligaments connect bone to bone.Tendons connect your muscles to your skeleton so that your muscles will make the bones move to were you need it to go.
They found an animal's bone in the woods. The bone she broke healed well. When you break a bone, you may need to have it set by a doctor.
bone marrow is so your bones don't break as easily
more than likely if you break you tibia you will need crutches yes.
Muscle cells, of course. You are always using you muscles, which are supported by static bone structurally (excluding smooth and cardiac muscle, which also need much ATP but not static support ), so these muscles need a lot of ATP energy that is supplied by the mitochondria.
You can't make a collar. When you get a wolf, they automatically get a red collar. You don't need to make a collar.
Skeletal muscles work in pairs to move a bone so that the muscles can function properly. Muscles can only pull, therefore bones need two muscles to make it move. To put a finger up one muscle might pull, the other will put to put back down. With two, the movement will be smooth, otherwise it will be "jerky" and uncontrolled.