Physiology 1021 Lecture 3: Lecture 3

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: Angela Nissen

Document Summary

Bundles of fascicles -> fascicles contain bundle of muscle cells/fibers -> muscle fibers contain myofibrils -> myofibrils are made up of myofilaments. Make a flow chart for the skeletal muscle structure: Bundles of fascicles -> made of bundles of muscle fibers -> made of myofibrils -> made of myofilaments -> thick or thin myofilaments. Why is a skeletal muscle cell striated: from the arrangement of thick and thin myofilaments. Depending on the whole size of the muscle. Why are skeletal muscle cells unique: they are multinucleated unlike most cells in the body (they only contain one nucleus) Name the parts of the muscle cell and their function: Sarcolemma: cell membrane that surrounds the cell, cytoplasm lies inside this. Myofibrils: bundles of fibers inside of the cell, composed of thick and thin myofilaments. Thick and thin myofilaments: makes up the myofibrils.