Muscle Tissue And Functions

Transforms chemical energy (ATP) to directed mechanical energy - exerts force

Skeletal,Cardiac,Smooth

Myo, mys, and sarco

excitability, contractility, extensibility, elasticity

responsiveness or irritability): ability to receive and respond to stimuli

ability to shorten forcibly when stimulated

ability to be stretched

ability to recoil to resting length

Movement of bones or fluids (e.g., blood) -Maintaining posture and body position -Stabilizing joints -Heat generation (especially skeletal muscle

Protects organs, forms valves, controls pupil size, causes "goosebumps"

Organs attached to bones and skin -Elongated cells called muscle fibers -Striated (striped) -Voluntary (i.e., conscious control) -Contract rapidly; tire easily; powerful -Require nervous system stimulation

Only in heart; bulk of heart walls -Striated -Can contract without nervous system stimulation -Involuntary

In walls of hollow organs, e.g., stomach, urinary bladder, and airways -Not striated -Can contract without nervous system stimulation -Involuntary

skeleton

movement, heat, posture

striated, multi-nucleated (eccentric), fibers parallel

voluntary

heart

pump blood continuously

striated, one central nucleus

involuntary

G.I. tract, uterus, eye, blood vessels

Peristalsis, blood pressure, pupil size, erects hairs

no striations, one central nucleus

involuntary