Muscle Tissue

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Muscle tissues

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highly cellular, well-vascularized tissues that are responsible for most types of body movement

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Myofilaments

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Muscle cells possess myofilaments, elaborate versions of the actin and myosin filaments that bring about movement or contraction in all cell types

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What are the three types of muscle tissue?

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Skeletal, cardiac, and smooth

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Skeletal muscle tissue

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Skeletal tissue is packaged by connective tissue sheets into organs called skeletal muscles that are attached to the bones of the skeleton. These muscles form the flesh of the body, and as they contract, they pull on bones or skin, causing body movements.

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Muscle fibers

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Skeletal muscle cells, also called muscle fibers, are long, cylindrical cells that contain many nuclei. Their obvious banded, or striated, appearance reflects the precise alignment of their myofilaments.

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Cardiac Muscle

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Found in the wall of the heart only
Striated
Involuntary
One nucleus

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Intercalated Discs

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Cardiac cells are branching cells that fit together tightly at unique junctions called intercalated discs

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Smooth muscle

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*Have no visible striations
*Spindle shaped
*One centrally located nucleus
*Found in walls of hollow organs other than the heart - Acts to squeeze substances by contraction and releasing

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Voluntary muscle

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muscle contraction under our conscious control - SKELETAL MUSCLE - MOVEMENT

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Involuntary Muscle

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muscle contraction not under our conscious control -CARDIAC and SMOOTH MUSCLE