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pairs of muscles that work together so that when one muscle contracts, the other relaxes; they pull in opposite directions
How do you keep your cardiac muscles strong?
By elevating your heart rate for 30 minutes or more several times a week
Name two places in your body where you find smooth muscles
Blood vessels, stomach, intestines, and bladder
rapid eye movement sleep (REM sleep)
part of the sleep cycle where your eyes move a lot; there is high brain activity and relaxation of the large muscles
when voluntary muscles move automatically without you consciously thinking about it
these muscles have no striations or stripes; they can be found in blood vessels, stomach, intestines or bladder
a disease which begins with the masseter tightening and preventing the jaw from opening; it is also called lockjaw
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