ANP 1105 Lecture Notes - Lecture 2: Endoplasmic Reticulum, Skeletal Muscle, Myocyte

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jacqueline Carnegie

Document Summary

Skeletal and smooth muscle cells (but not cardiac muscle cells) are elongated and are called. Terminology: (cid:862)myo- or mys-(cid:863) = mus(cid:272)les, (cid:862) ar(cid:272)o-(cid:863) = flesh. Found in the walls of skeleton walls) Skeletal muscle fibers are the longest muscle cells and have obvious strips called striations. It can contract rapidly but it tires easily and must rest after short periods of activity. Involuntary (contracts without being stimulated by the nervous system) Contracts at a fairly steady rate set by the heart"s pa(cid:272)e(cid:373)aker. Neural input can change rate hallow visceral organs, such as stomach, urinary bladder, and respiratory passages. Its role is to force fluids and other substances through internal body channels. Excitability/responsiveness: is the ability of cell to receive and respond to a stimulus by changing its membrane potential. Stimulus is usually a chemical (nt, hormone, ph) Response is the ap along the sarcolemma and muscle contraction. Contractility: is the ability to shorten forcibly when adequately stimulated.