BIOL 1410 Lecture Notes - Epicranial Aponeurosis, Titin, Three-Way Junction

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1410
• Professor: Jennifer Mcleese

Document Summary

Anchors to bone (periosteum) cartilage, skin or fascia of other muscles. Attached to z discs by titin (protein) Has tail with 2 globular heads (head extends toward actin and forms crossbridge) Myofilaments create dark and light bands/striations of the sarcomere. A band: length of thick filaments - myosin + actin (with troponin and tropomyosin) H zone: lighter band at center of a band myosin only. I band: light=actin (with troponin and tropomyosin) and titin. Z disc: proteins in center of i band, actin and titin attach, connect sarcomeres. M line: myosin tail connect to each other (center of sarcomere) Sarcomeres join end to end at z discs to form myofibrils. Light: no overlap, h zone myosin only, i band actin only. Parts of sarcolemma that extend deep into fiber/cell. Directly encircle myofilaments of myofibrils t junction of a and i bands (2/sarc) Triad: 2 enlarged areas of sr (terminal cisternae) and t-tubule.