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Chapter 9

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  • 3 Types of Muscle

    Smooth

    Cardiac

    Skeletal

  • Smooth Muscle

    –Found in walls of hollow organs

    ▪Examples: stomach, urinary bladder, and airways

    –Not striated

    –Involuntary: cannot be controlled consciously

    –Key words for smooth muscle: visceral, nonstriated and involuntary

  • Skeletal Muscle

    –is packaged into skeletal muscles: organs that are attached to bones and skin

    –Skeletal muscle fibers are longest of all muscle and have striations (stripes)

    –Also called voluntary muscle: can be consciously controlled

    –Contract rapidly; tire easily; powerful

    –skeletal, striated, and voluntary

  • Cardiac Muscle

    is found only in heart

    ▪Makes up bulk of heart walls

    –Striated

    –Involuntary: cannot be controlled consciously

    ▪Contracts at steady rate due to heart’s own pacemaker, but nervous system can increase rate

    striated, and involuntary

  • Characteristics of Muscle Tissues

    -Excitability

    -Contractility

    -Extensibility

    -Elasticity

  • Excitiability

    (responsiveness): ability to receive and respond to stimuli

  • Contractibility

    ability to shorten forcibly when stimulated

  • Extensibility

    –ability to be stretched

  • Elasticity:

    ability to recoil to resting length