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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 |