muscular system

3 muscle types:

voluntary muscles

involuntary muscles

cardiac muscles

voluntary muscles:

under conscious control

attached to skeletons by tendons

when it contracts it pulls against skeleton to make movement

cylindrical fibres are long and thin

involuntary muscles:

not under conscious control

located in blood vessels and digestive system

roles are digesting food and expelling waste

important in vascular shunting of blood to active areas

cardiac muscle

cannot be controlled

circulates blood around the body

only found in the muscle of heart

antagonistic pairs:

muscle that contracts is the agonist

muscle that relaxes is the antagonist

muscular system:describes all the muscles in the body…