BIO 211 Lecture Notes - Lecture 6: Anatomical Terms Of Location, Caveolae, Desmosome
Document Summary
Unit f: muscle system: muscle cells, muscle cell (myofiber) types. Skeletal: long, cylindrical and multinucleated; look like fibers: striated, voluntary, attach to bones. Smooth: fusiform in shape: single nucleus, no striations, involuntary, stomach, intestines, around vessels, iris, cardiac: bifurcating, singe nucleus, striated, involuntary, intercalated discs, thickening of plasma membrane, rich in desmosomes and gap junctions. Strengthen fiber for vigorous contractions: only in heart, properties of muscle tissue. Electrical excitability: produce and propagate action potentials: autorhythmic - heart, chemical - nt, contractility: generate force/tension in response to ap. Elasticity: return to original shape after contraction or extension: muscle tissue function, five basic functions. Store and remove materials from body (form sphincters: generate heat. Abduction - away from midline: circumduction - mvmt one end appendage in circle, other fixed, dorsiflexion - toes up. Extension - increased angle between articulating bones: muscle system organization, levels of organization. Fascicles (bundles of myofibers) - contain individual muscle cells.
