they join with the bones and are responsible for the bones' movements. they contract voluntary and are fast and non-persistent, which means they get tired

striated muscles

Striated muscle fibre, smooth muscle, cardiac muscle

long or fusiform, flat, circular or sphincters

smooth muscles

biceps and triceps

move and maintain the posture of the body, help internal organs perform movements

agonists

long or fusiform muscles

a motor neuron sends the order to the muscle and the muscle cells produce the necessary energy

cardiac muscles

they close or open a cavity or tube, they can be found in the mouth and lips

a handle resting on a fulcrum or pivot, used to move heavy objects