2. Skeletal Muscle Physiology_for class

2. Skeletal Muscle Physiology_for class - Muscular Control...

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Muscular Control 1 r Smooth c Involuntary muscle c Walls of blood vessels, internal organs r Cardiac c Involuntary muscle c Controls itself with help from nervous and endocrine systems r Skeletal c Voluntary muscle c Over 600 throughout the body Types of Muscles Smooth Cardiac Skeletal Skeletal Muscle Structure A Muscle Fiber Arrangement of Filaments Arrangement of Filaments in a Sarcomere
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Muscular Control 2 An Actin Filament Events Leading to Muscle Action r Motor neuron releases acetylcholine (ACh) r ACh binds to receptors on ___________ r Action potential releases _________ r Calcium binds to troponin ––> pulls tropomyosin off active sites ––> myosin heads attach to actin Events in Muscle Contraction Contracting Muscle Fiber The Sliding Filament Theory r Myosin cross-bridges activate, binding with actin (changes cross-bridge) r Myosin head tilts toward arm of cross-bridge and drags actin and myosin in opposite directions r Tilt of myosin head is a __________ r Pulling of actin past myosin causes muscle shortening and generates force
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This note was uploaded on 09/25/2011 for the course KINS 3163 taught by Professor Staff during the Fall '11 term at Arkansas.

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2. Skeletal Muscle Physiology_for class - Muscular Control...

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