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hemoglobin found only in skeletal muscle that carries oxygen and provides a dark red color
explain the all or none principle
muscles will either fully contract or not contract at all. they will never partially contract.
why does cardiac muscle have a long refractory period
the heart muscle needs time to recover in order to keep a normal heart beat, while skeletal muscle are constantly in use and don't need as long to recover.
place muscle components in order from simplest to most complex
actin and myson, myofibril, fascicle, muscle
what are cross bridges and where are they found
myosin heads that interlock in order to aid in muscle contraction, found on contractile units
effects of anabolic steriod use
increase muscle size, strength, and endurance
increase in breast size in men
decrease in breast size in women
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