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Chapter 6: Muscles
Anatomy/ Physiology
Question | Answer |
---|---|
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 |