increased number of filaments expands the fibre, causing muscle
enlargement and definition - NOT growth of NEW muscle cells
What happens if the muscle is overstretched?
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Actin and myosin are far apart and force cannot be generates
step 1 of contraction cycle
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Myosin heads hydrolyze ATP and become reoriented and energized
In what order are muscle fibres recruited?
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Slow oxidative, then fast oxidative, then fast glycolytic
What characterizes the I-band?
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, light passes through (actin)
Where is Ca2+ stored when it is removed
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Sarcoplasmic reticulum
What is the sarcomere?
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Smallest contractile unit in muscle; Z-line to Z-line composed of actin and
myosin
What are the functions of muscles? (4)
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-movement
-stabilization
-storing and moving substances
-generating heat
What is a fused tetanus contraction?
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