BIO 365R Lecture 14--Muscle I

BIO 365R Lecture 14--Muscle I - Muscle and how it contracts...

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•How muscle fibers contract What powers contraction •How contraction is controlled •The role of action potentials for initiating contraction •How a muscle twitches and how it produces a smooth contraction •How a muscle can generate various amounts of force Proteins that compose muscle and their significance of the architectural arrangement of those proteins Muscle and how it contracts
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Axons innervating Muscle fibers
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sarcomere Z Z Z A band Actin + myosin Electron micrograph of Part of a myofibril H zone myosin H zone myosin I band actin I band actin
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Z line Z line Only actin actin + myosin Only actin Myosin only
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Myosin Filament Myosin Molecule
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Flexible or hinge region
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Sarcomere shortens
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ATP binding site ATP ATP ADP P + 1) Myosin is bound to Actin 2) Myosin binds ATP and disassociates from Actin 3) ATP is split causing myosin head to ratchet back 4) Myosin binds to Actin ADP P + P + 5) Power Stroke- phosphate is released from myosin allowing
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This note was uploaded on 04/12/2009 for the course BIO 51340 taught by Professor Zakon during the Spring '09 term at University of Texas.

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BIO 365R Lecture 14--Muscle I - Muscle and how it contracts...

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