KINE 1P90 Lecture Notes - Lecture 6: Catecholamine, Sympathetic Nervous System, Ventricular Fibrillation

• School: Brock University
• Department: Physical Education and Kinesiology
• Course: KINE 1P90
• Professor: Klentrou Panagiota

Document Summary

Only muscle in the body that does not depend on the brain to function. Cardiac muscle generates its own electrical signal: autoconduction. 1% of cardiac muscle cells are specialized and spontaneously initiate contraction o o o o. Electrical impulses stimulate the heart muscle to contract. Contractile cells are 99% of the cardiac muscle cells and do the. Autorhythmic cells are 1% of the cardiac muscle cells. Autorhythmic cells do not have a resting potential bit rather they have a. Unlike other cells with a resting potential (a stable electric difference across the membrane), cells with a pacemaker potential have an electric difference across the membrane that is constantly changing, by itself. The electric charge across the cell membrane is constantly changing , due to the movement of potassium, sodium, and calcium ions across the membrane. When the cycle starts, the cell has a negative electrical charge of about -60mv, this means;