APK 3110C Lecture Notes - Lecture 6: Overcoat, Glycogen, Dystrophin
5 Mar 2018
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Document Summary
Skeletal and smooth muscle cells are elongated and called muscle fibers (not cardiac muscle) Packaged into skeletal muscles, organs that attach to and cover bony skeleton. Found in walls of hollow visceral organs, such as the stomach, bladder, and respiratory passages; non-striated involuntary muscle. Excitability: responsiveness; responds to stimuli by changing membrane potential. Stimulus usually a chemical such as a neurotransmitter released by nerve center. Contractility: ability to shorten forcibly when adequately stimulated; makes muscle tissue different from all other tissues in the body. Elasticity: muscle cells can recoil and resume its resting length after stretching. Smooth muscle forms valves to regulate passage of substances through internal organs. Epimysium: overcoat of dense irregular connective tissue that surrounds the whole muscle. Perimysium: layer of dense irregular connective tissue surrounding each fascicle: muscle fibers grouped within each skeletal muscle. Endomysium: a wispy sheath of connective tissue that surrounds each individual muscle fiber-- consists of fine areolar connective tissue.
