Physiology 1021 Lecture Notes - Lecture 1: Globular Protein, Relaxed Muscle, Atp Hydrolysis

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: Dr. Beye

Document Summary

Contractile systems: biological machines that utilize chemical energy from the metabolism of food in the form of adenosine triphosphate (atp) hydrolysis to perform useful work. Skeletal muscle cells: primarily used for voluntary movement. Smooth muscle cells: found in the walls of hollow viscera, blood vessels and various ducts. Cardiac muscle cells: muscle of the heart. Length of muscle cell can vary from 1mm-12cm long, muscle cells contain many nuclei and mitochondria to make atp. Thick myofilaments: contractile proteins, composed of many myosin molecules. Each head has a binding site for actin and an. Atpase (binding site for atp) that breaks down atp to adp and pi and releases energy for contraction. Sarcolemma: cell membrane that surrounds the muscle cell, cytoplasm inside is the sarcoplasm. Sarcoplasmic reticulum (sr): a specialized organelle found between adjacent t-tubules that also wraps around the myofibrils; a hollow structure where calcium (ca++) is stored inside the muscle cell.