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1. thin filamentsslide toward M lin, alongside thick filaments
2. width of A zone remains the same
3. Z lines move closer together
,__ phase of a twitch, Ca+ levels fall, active sites are covered, tension falls to resting
levels
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relaxation
max tension development or peak of tension is btw __ and __ phase of twitch
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btw contraction and relaxation phases
__ is when the body needs mor O2 than usual to normalize metab. activities
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O2 debt
Muscle __, is the lack of muscle activity, it reduces muscle size, tone and power
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muscle atrophy
,step of contraction cycle when in low energy form
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cross-bridge detachement
anaerobic metabolism produces __ ATP/ glucose
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2 ATP
what is the smallest contractile unit of muscle
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sarcomere
helping agonist
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symergist
, __ muscle attachment that remains fixed
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origin
__ effect after muscle elongation following contraction, reverse the direction of the
original motion
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opposing muscle contractions
__ metab. is the primary energy source for peak muscular activity
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anaerobic
__ surrounds the sarcoplasm (cytoplasm of muscle fiber)
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sarcolemma