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A&P Chapter 10 - Chapter 10 Zool 2013 Muscle Tissue...

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Chapter 10: Zool 2013: Muscle Tissue Lecture Outline Dr. Navin Maswood Alternating contraction and relaxation of cells Chemical energy changed into mechanical energy Three types of Muscle Tissue: Skeletal Muscle Tissue: striated & voluntary in action Cardiac Muscle: striated & involuntary in action Smooth Muscle: non-striated & involuntary in action
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Functions of Muscle Tissue Producing body movements Stabilizing body positions Regulating organ volumes bands of smooth muscle called sphincters Movement of substances within the body blood, lymph, urine, air, food and fluids, sperm Generates heat (thermogenesis) involuntary contractions of skeletal muscle (shivering)
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Properties of Muscle Tissue Excitability respond to chemicals released from nerve cells Conductivity ability to propagate electrical signals over membrane Contractility ability to shorten and generate force Extensibility ability to be stretched without damaging the tissue Elasticity ability to return to original shape after being stretched
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Skeletal muscle attaches to bone, skin or fascia Multinucleated striated with light & dark bands visible with scope voluntary control of contraction & relaxation Contraction is initiated by motor neurons and groups of cells work together as Motor Units
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Connective Tissue Components of Skeletal Muscle Tissues (Figure 10.1) Superficial fascia = separates muscles from underlying the skin, composed or areolar & adipose CT, pathway for nerves, blood & lymphatic vessels Deep fascia = dense irregular connective tissue around muscle lines body wall & limbs, allows free movement of muscles Connective tissue components of the muscle include epimysium = surrounds the whole muscle perimysium = surrounds bundles (fascicles) of 10-100 muscle cells endomysium = separates individual muscle cells All these connective tissue layers extend beyond the muscle fibersy to form the tendon
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Fig. 10.01
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Nerve and Blood Supply Each skeletal muscle is supplied by a nerve, artery,two veins & multiple capillaries The neurons that stimulate skeletal muscles to contract are somatic motor neurons Each motor neuron supplies multiple muscle cells (neuromuscular junction) Each muscle cell is supplied by one motor neuron terminal branch and is in contact with one or two capillaries. nerve fibers & capillaries are found in the endomysium between individual cells
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Every mature muscle cell developed from 100 myoblasts that fuse together in the fetus. (multinucleated) Mature muscle cells can not divide Muscle growth is a result of cellular enlargement & not cell division Satellite cells retain the ability to regenerate new cells.
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