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Chapter 6: Muscles

Anatomy/ Physiology

The ability of skeletal muscles to shorten with force Contractiliy
Capacity of skeletal muscles to respond to a stimulus Excitability
Ability to be stretched Extensibility
Ability to recoil to their original resting length after they have been stretched Elasticity
Connective tissue sheath that surrounds each skeletal muscle Epimysium
Connective tissue located outside the epimysium; surrounds and separates muscles Fascia
Connective tissue sheath that surrounds each fiber Endomysium
Threadlike structure that extends from one end of the fiber to the other Myofibrils
Sigle muscle cells Fibers
Thin myofilaments Actin myofilaments
Thick myofilaments Myosin myofilaments
Highly ordered units joined end to end to form the myofibril Sarcomere
Basic structural and functional unity of the muscle Sarcomere
Nerve cells that carry action potentials to skeletal muscle fibers Motor neurons
Brief reversal back of the charge when a muscle cell is stimulated Action potential
Light area on each side of the Z line; consists of actin I band
Darker central region in each sarcomere that extends the length of the myosin A band
Muscle attached to bones or to skin Skeletal muscle
Muscle found in the heart Cardiac muscle
Muscle that has no striations and is involuntary Smooth muscle
Muscle located mostly in walls of hollow visceral organs (other than the heart) Smooth
Created by: KeikoMorelia



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