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An elbow is a joint that helps you bend your arm.
your elbow
No, everyone has an elbow so that their arm can bend.
The bones will heal in the wrong position therefore the elbow might not be able to bend and move. If this happens, the way some doctors reset the arm is by re-breaking the elbow then setting the arm in the correct position in surgery.
at the elbow. "Flexion of the arm" just means to bend it.
your biceps contract and your triceps relax
Triceps does not help to bend your arm. It helps to straighten your upper limb across the elbow.
hinged.......
It is the bend in your arm (on the inside, opposite from your elbow).
When you bend your arm at the elbow, your hand will move towards your shoulder.
You have 2 main bones as there is a joint in your elbow (funny bone). If you had one then your arms would be like a very strong stick. Sticks cannot bend.
Your elbow and your wrist.