IB131_9.18.09_Muscle Tissue

IB131_9.18.09_Muscle Tissue - Muscle Muscle...

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± uscle Latin word for “little mouse” Muscle a Latin word for little mouse ± Muscle is the primary tissue in the Heart (cardiac MT) Walls of hollow organs (Smooth MT) ± Skeletal muscle Makes up nearly half the body’s mass
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± Muscle is a primary tissue÷into 3 muscle types ± Skeletal muscle tissue Packaged into skeletal muscles Makes up 40% of body weight Cells are triated esae sa e d ± Cardiac muscle tissue occurs only in the walls of the heart ± Smooth muscle tissue occupies the walls of hollow organs ells lack striations Cells lack striations
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Table 10.2 (1 of 3)
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Table 10.2 (2 of 3)
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Table 10.2 (3 of 3)
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± Cells of muscles = muscle fibers ± Muscle contraction Depends on 2 types of myofilaments (contractile proteins generate contractile force) Actin myosin ± Plasma membrane is called a sarcolemma ± Cytoplasm is called sarcoplasm ± Each muscle is an organ onsists mostly of uscle tissue Consists mostly of muscle tissue Skeletal muscle also contains Connective tissue Blood vessels Nerves
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± Responsiveness (excitability) ontracts in response to chemical signals stretch & Contracts in response to chemical signals, stretch & electrical changes across the plasma membrane ± Conductivity llt il h ti f it ti th t local electrical change triggers a wave of excitation that travels along the muscle fiber ± Contractility Long cells shorten when stimulated, generating pulling force ± Extensibility capable of being stretched back to its original length by contraction of an opposing muscle ± Elasticity returns to its original resting length (recoils) after being stretched
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± eletal Muscles Skeletal Muscles Are attached to the skeletal system Allow us to move The muscular system Includes only skeletal muscles
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± Produce skeletal movement ± Maintain body position ± Joint stabilization pport soft tissues ± Support soft tissues ± Guard openings ± Maintain body temperature ± Store nutrient reserves
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± Nerves Skeletal muscles are voluntary muscles, controlled by nerves of the central nervous system (brain & spinal cord) y ( p ) ± Blood Vessels Muscles have extensive vascular systems that Supply large amounts of oxygen Supply nutrients Carry away wastes
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± Nerves & blood vessels Each skeletal muscle supplied by branches of One nerve One artery One or more veins Nerves & vessels branch repeatedly Smallest nerve branches serve Individual muscle fibers euromuscular junction gnals the muscle to contract Neuromuscular junction – signals the muscle to contract
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± onnective tissue sheaths are continuous / ndons Connective tissue sheaths are continuous w/ tendons ± Connective tissue & fascicles onnective tissue sheaths bind a skeletal muscle its
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IB131_9.18.09_Muscle Tissue - Muscle Muscle...

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