Physiology 2130 Lecture Notes - Lecture 7: Heart Valve, Atrioventricular Node, Purkinje Fibers

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: Anita Woods

Document Summary

Function and role as transport system: transports oxygen and nutrients to the tissues of the body. It removes carbon dioxide and waste products from the tissues. It functions to regulate body temperature and ph. It transports and distributes hormones and other substances throughout the body. Components of the transport system: a central pump the heart, a closed system of blood vessels, the fluid medium (blood) through which various substances are transported. Function of myocardial cells: contract the same was as skeletal muscle cells & have many of the same features. Gap junctions allow the movement of ionic currents between cells. This way, one action potential in one contractile (cid:272)ell (cid:449)ill sp(cid:396)ead to all the othe(cid:396)s so : one contractile cell contract all contractile cells contract. The cells of the sa node have a relatively greater sodium and calcium permeability, compared to other cells of the heart. At threshold (-40mv) ca voltage gated ion channels open.