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Bio 124 Chapter 9
Muscles
7
Biology
Undergraduate 4
04/03/2014

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Term
Three types of muscle tissues
Definition
Skeletal, cardiac, smooth
Term
Skeletal muscles
Definition
-Organs attached to bones and skin
-Elongated cells called muscle fibers
-Striated
-Voluntary
-Contract rapidly, tire easily, powerful
-Require nervous system stimulation
Term
Cardiac muscle
Definition
-Only in heart; bulk of heart walls
-Striated
-Can contract without nervous system stimulation
-Involuntary
Term
Cardiac muscle
Definition
-Only in heart; bulk of heart walls
-Striated
-Can contract without nervous system stimulation
-Involuntary
Term
Smooth muscle
Definition
-In walls of hollow organs
-Not striated
-Can contract without nervous system stimulation
-Involuntary
Term
Special characterstics of Muscle Tissues (4)
Definition
-Excitability: ability to receive and respond to stimuli
-Contractility: ability to shorten forcibly when stimulated
-Extensibility: ability to be stretched
-Elasticity: ability to recoil to resting length
Term
Four important muscle functions
Definition
-movement of bones or fluids (blood)
-maintaining posture and body position
-stabilizing joints
-heat generation
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