BIOL 031 Lecture Notes - Lecture 15: Alpha Motor Neuron, Neuromuscular Junction, Myosin Head

• School: College of The Sequoias
• Department: Biology (BIOL)
• Course: BIOL 031
• Professor: carey

Document Summary

Lec identify the various sarcomere bands, lines, and zones. A-band: one of the transverse bonds making up repeated striations of skeletal muscle region of aligned myosin containing thick filaments. I-band: one of transverse bands making up repeating striations of skeletal muscle ; located between a bands of adjacent sarcomeres bisected by z-line. H-zone: one of transverse bands making up striated pattern of cardiac and skeletal muscle; light region that bisects a band. Z-line: structure running across myofibril at each end of striated muscle sarcomere; anchors one end of thin filaments and titin. M-line: transverse stripe occurring at the center of the a band. Heavy chains: myosin molecule is composed of two large polypeptide chains. Light chains: four small chains composing the thick filament. Myosin head: reaches to the thin filament. Atp binding sites: where atp splits energy causing power stroke. Actin binding sites: where myosin binds to atp. 2 long string of pearls twisted into helix, has 2 binding sites.