BIOL 460 Lecture Notes - Lecture 10: Endoplasmic Reticulum, Myofilament, Sarcomere

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Skeletal muscle: tendons attach bone to muscle, ligaments attach bone to bone, voluntary, 3 types of connective tissue. Extends the length of the entire muscle: surface has periosteum (dense connective tissue) Tendon connects to periosteum and is made of sheets of connective tissue that form epimysium and perimysium. Sheets of co(cid:374)(cid:374)ecti(cid:448)e tissue co(cid:374)ti(cid:374)ues past (cid:449)here the (cid:373)uscle stops a(cid:374)d does(cid:374)"t i(cid:374)clude endomysium. Perimysium fuses seamlessly to connective tissue: muscle is striated or striped, dark and light stripes. Light stripes: i band: many nuclei in the muscle fiber. Each myoblast is a single cell with own nucleus. During muscle formation, myoblasts fuse together: muscle fibers are not capable of cell division because they are long and complex. Plasma membrane of muscle fibers is called sarcolemma. Inside a muscle is fasciculi (groups of muscle fibers) Myofibrils are divided into repeating structures called sarcomeres: sarcomeres have smaller filaments called myofilament. All of the myofibrils are lined up in register.

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