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What do muscles allow the body to do?
move and maintain the posture of the body, help internal organs perform movements
What are three shapes of muscles?
Striated muscle fibre, smooth muscle, cardiac muscle
What are three contraction types of muscles?
long or fusiform, flat, circular or sphincters
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 muscles are part of the internal organs? their contraction is involuntary, slow and long lasting
smooth muscles
What muscles are found in the heart?
cardiac muscles
what contraction type is when muscles normally intervene in the movement of the body?
long or fusiform muscles
What are flat muscles?
they generally cover and protect the organs
What is an example of fusiform muscles?
biceps and triceps
what are circular or sphincters muscles?
they close or open a cavity or tube, they can be found in the mouth and lips
What type of muscles form tendons?
striated muscles
How do muscles contract?
a motor neuron sends the order to the muscle and the muscle cells produce the necessary energy
What are muscles called that cooperate together to perform one unique movement?
agonists
What is a lever?
a handle resting on a fulcrum or pivot, used to move heavy objects
