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a relaxing muscle

a type of muscle that does not tire

a muscle type that works automatically

a muscle type we have conscious control over

a sprinter uses .... ...... muscle fibres

a long distance runner uses .... ...... muscle fibres

a muscular contraction that causes the muscle to change length

a muscular contraction that stays the same length when under tension

what is stored in the liver and muscles and is released to allow muscle contraction

contracting muscles produce ...