BIOL302 Lecture Notes - Lecture 6: Phospholipid, Lamellar Corpuscle, Sarcomere
27 Jan 2017
School
Department
Course
Professor
Document Summary
Muscle tissue: generate force through contraction, movement, structural support, metabolically active tissues that require lots of mitochondria, atp, and oxygen supply. Endomysium: surrounds individual muscle bres, incredibly thin squamous epithelium. Sarcomere: myo bril contractile unit, arrangement of muscle bres that appears striated. Contractile apparatus: goes from z line to z line (middle of light section) A-band: appears dark (overlap of actin and myosin), unchanged size upon contraction. I-band: light coloured area of actin, size decreases upon contraction. Contractile regulation: bre twitch rate depends on nerve input. Motor unit: one nerve bre that innervates multiple bres. Motor end plate: modi ed synapse where a nerve meets a muscle, neuromuscular junction. Skeletal muscle: voluntary movement of skeleton, striated, attened nuclei in periphery, can be multi-nucleated. Cross section: polygonal shape massive cells, bundles of fascicles (space between fascicles visible), speckles in cell. Longitudinal: long and unbranched, span the width of the eld of view, striations visible.
