a handle resting on a fulcrum or pivot, used to move heavy objects
How do muscles contract?
a motor neuron sends the order to the muscle and the muscle cells produce the necessary energy
What is the function of a striated muscle fibre?
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
what are circular or sphincters muscles?
they close or open a cavity or tube, they can be found in the mouth and lips
What are flat muscles?
they generally cover and protect the organs
What do muscles allow the body to do?
move and maintain the posture of the body, help internal organs perform movements