Muscles are attached to bones by structures called tendons. When muscles
contract, get shorter they pull on the bone allowing it to move
As muscles can only pull on a bone, muscles exist in pairs, which allow a
bone to return to its original position once pulled by a muscle.
Antagonistic muscles work in opposite directions
For example – a pair of antagonistic muscles are biceps and triceps.
The biceps contracts to pull the forearm upwards, while this occurs triceps
Triceps contracts to pull the forearm down, while this occurs the bicep relaxes