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Anatomy chapter 9

Terms in this set (29)

Attached to bones and skin- striated voluntary
Skeletal muscle tissue:
Only in the heart- striated- involuntary
Cardiac muscle tissue:
In the walls of hollow organs- not striated- involuntary
Smooth muscle tissue:
Ability to shorten when stimulated
Contractibility
Ability to be stretched
Extensibility :
Movement of bones or fluids (ex: blood)
Muscle function #1
Maintaining posture and body position
Muscle function #2
Stabilizing joints
Muscle function #3
Heat generation (especially in skeletal muscle)
Muscle functions #4
Connection tissue surrounding entire muscle
Epimysium
Connective tissue wrappings extend beyond the muscle as a rope like tendon or sheet like aponeurosis
Muscle attach indirectly:
Densely packed, rodlike elements
Myofibrils
80%
How much percentage is myofibrils of cell volume??
Smallest contractile unit (functional unit) of a muscle fiber.
Sarcomere
Composed of the protein myosin
Ultrastructure of thick filaments :
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