MusclePart1 - Muscles Chapter 8 Contraction Relaxation of...

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1 Muscles Chapter 8: Contraction & Relaxation of Skeletal Muscle Metabolism in Skeletal Muscle Control of Muscle Tension & Tone Types of Skeletal Muscle Cells
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2 Muscle
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3 Skeletal muscle structure
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4 Fine structure
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5 What actually contracts?
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6
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7 What is meant by “sliding filament”?
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8 Power Stroke Myosin ATPase splits ATP into ADP + P Myosin heads attach to actin P release causes head to swing like an oar Powerstroke ADP released, myosin bound to actin (rigor) ATP binding to myosin releases actin
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9 What is Excitation-Contraction Coupling? Contraction Cycle: Attachment Pivoting Detachment Return
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10 Nervous system ->Acetylcholine ->Motor end plate ->ACHesterase ->Muscle action potential The Neuromuscular Junction
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11
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12 Relaxation Contraction cycle continues UNTIL: Ca++ levels return to normal OR Cell runs out of ATP
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13 What is the role of ATP in muscle contraction?
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This note was uploaded on 09/25/2009 for the course BIOSC 1080 taught by Professor Roberets during the Summer '07 term at Pittsburgh.

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MusclePart1 - Muscles Chapter 8 Contraction Relaxation of...

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