ANP 1105 Lecture Notes - Lecture 5: Endoplasmic Reticulum, Interstimulus Interval, Myocyte

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Contraction rate can be increased by neural rate. Makes up the walls of hollow, visceral organ (gi tract) Excitable: ability to receive and respond to stimulation. Contractility: ability to shorten forcibly when adequately stimulated. Extensibility: ability to extend or stretch when stimulated. Elasticity: ability to return to resting length. Each muscle fiber (cell) consists of myofibrils. Sarcomeres refer to the space between adjacent z lines. Myofilaments refer to either the thin filaments that are made of actin strands, or thick filaments that are made of myosin strands. Z discs are what anchors all the thin filaments and individual fibers together. H lines are the only area of a muscle fiber that has no thin filaments. M lines refer to the section of the muscle fiber where adjacent thick filaments connect. Made up of 2 heavy myosin chains and two globular heads. The cross bridge is where the 2 globular heads come together to create an actin-binding site.