Physiology 1021 Chapter Notes - Chapter 8: Qrs Complex, Tight Junction, Toothpaste

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: Tom Stavraky

Document Summary

Introduction during the course of an average life it will beat roughly 2. 5 billion times roughly 160,000 km (100,000 miles) of blood vessels that transport blood directly to almost every cell in your body. Anatomy the heart essentially consists of two side-by-side pumps: right atrium and ventricle, pumps blood to the lungs, left atrium and ventricle, pumps blood to the rest of the body. Myocardial cells two principal types of myocardial cells: myo = muscle, cardio = heart. Origin of self-excitability nearly all of the cells in the heart can spontaneously generate action potentials, the sinoatrial node (or sa node) is generally the site of origin. These ions are also responsible for the action potential in the heart; however, this action potential begins by itself important ions here will be na+, k+, and ca++ Na+are moving into the cell, down their concentration gradient. Na+ permeability is slightly higher here than in other cells.