7.1 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Muscle...

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UNIT 7 Muscles and Muscle Tissue (Chapter 9) Muscle Overview Skeletal Muscle Anatomy (7th edition)
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Muscle Overview The main tissue in the heart, skeletal muscles, and the walls of hollow organs Makes up nearly half the body’s mass Types of Muscle Tissue SKELETAL muscle tissue – packaged into skeletal muscles; makes up 40% of body weight CARDIAC muscle tissue – occurs only in the walls of the heart SMOOTH muscle tissue – occupies the walls of hollow organs and other diverse places in the body (7th edition)
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Muscle Overview Functional Features contractility – long cells shorten and generate pulling forces excitability – electrical nerve impulse stimulates the muscle cell to contract extensibility – can be stretched back to its original length by contraction of an opposing muscle (agonist / antagonist relationship) elasticity – can recoil after being stretched (7th edition)
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Muscle Overview Functions of muscle tissue movement (e.g. skeletal muscle moves body by moving the bones) squeezes fluids and other substances through hollow organs (smooth muscle) maintenance of posture – enables the body to remain sitting or standing joint stabilization heat generation – muscle contractions produce heat (“shivering”) to help maintain normal body temperature allows breathing to occur - e.g. the diaphragm contracts and relaxes to enable air to enter and exit the lungs (7th edition)
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SKELETAL MUSCLE ANATOMY Each skeletal muscle is an
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7.1 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Muscle...

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