BIOL 150B Chapter Notes - Chapter 40: Endoplasmic Reticulum, Myocyte, Skeletal Muscle
12 Oct 2016
School
Department
Course
Professor
Document Summary
Muscle: a tissue of composed of cells that are capable of contracting and thereby moving the parts of the body. The three types of vertebrate muscle (skeletal, cardiac, and smooth) differ somewhat in function, appearance, and control. Skeletal muscle: under voluntary or conscious, control by the nervous system. Skeletal muscles can produce contractions ranging from quick twitches to powerful, sustained tension. An individual skeletal muscle consists of a series of nested, repeating parts. Skeletal muscles are encased in connective tissue sheaths, which merge to form tough, fibrous tendons that attach the ends of muscles to bones. Withi(cid:374) a (cid:373)us(cid:272)le"s outer sheath, i(cid:374)di(cid:448)idual (cid:373)us(cid:272)le (cid:272)ells = muscle fibers, are grouped into bundles by further coverings of connective tissue. Blood vessels and nerves pass through the muscle in the spaces between the bundles. Each individual muscle fiber also has its own thin connective tissue wrapping. I(cid:374)di(cid:448)idual (cid:373)us(cid:272)le fi(cid:271)ers (cid:272)o(cid:374)tai(cid:374) (cid:373)a(cid:374)(cid:455) parallel (cid:272)(cid:455)li(cid:374)ders" stru(cid:272)tures (cid:272)alled myofibrils.
