BIOL302 Lecture Notes - Lecture 6: Endoplasmic Reticulum, Myofibroblast, Myocyte
2 Feb 2016
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In these contractile cells, actin and myosin generate motile force. Myoepithelial cells expel secretions from glandular acini. Myofibroblast contractile role and secrete collagen, in scar tissue. Pericytes smooth muscle like cells that surround blood vessels. Individual nerve fibres branch within the muscle to supply a motor unit. Cross striations arrangement of contractile proteins. Extremely elongated multinucleate contractile cells, muscle fibers. Muscle fibers(=muscle cells) bound together by collagenous. Motor unit = group of muscle fibers. Epimysium surrounds entire muscle, connective tissue. Endomysium- surround each muscle fiber and contains capillaries and. Cross section polygonal, multinucleated, peripheral nucleus. Striation = sarcomere zline - i band (light), a band(dark) h band and nerves. Longitudinal long striated, peripheral nuclei, unbranched m line. Smooth muscle ( confusing with loose connective tissue) Muscular component of visceral structure such as blood vessels etc. Highly vascularized intercalated disks cells are larger and square.
