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Biol 216 8 Muscles 1-32.pdf

Biol 216 8 Muscles 1-32.pdf - Power Point 8 1 Learning...

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5/23/17 1 Power Point 8 5/23/17 1 Learning Goals 1. Detail thestructureof muscles, from themolecular level to their functioning at theorgan system level (i.e, recruitment, tetanus) 2. Explain thesliding filament mechanism of musclecontraction. 3. Compareand contrast theevents that occur at theneuromuscular junction with thosebetween two neurons. 4. Compareand contrast smooth and skeletal musclestructureand movement. 5. Describethe characteristics of slow and fast musclefibers in skeletal muscle. 5/23/17 2
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5/23/17 2 How are these related to today’s topic? 5/23/17 3 Functions ofthe Muscular System Movement of the body Maintenance of posture Respiration Production of body heat Communication Constriction of organs and vessels Contraction of the heart 9-4 5/23/17
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5/23/17 3 General Properties of Muscle Contractility : ability of a muscle to shorten with force Excitability : capacity of muscle to respond to a stimulus (from our nerves) Extensibility : muscle can be stretched to its normal resting length and beyond to a limited degree Elasticity : ability of muscle to recoil to original resting length after stretched 9-5 5/23/17 What are the 3 types of muscle tissue? 9-6 5/23/17
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5/23/17 4 Skeletal Muscles : many attached to bones via tendons (connective tissue ) Appear striated (due to thick and thin filaments) Cells are multi-nucleated Under voluntary control. Human body > 600 muscles 5/23/17 7 Types of Muscle Tissue 1. Skeletal Responsible for locomotion, facial expressions, posture, respiratory movements, other types of body movement Voluntary 9-8 5/23/17
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5/23/17 5 2. Smooth
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