HLSC 1F90 Lecture Notes - Lecture 20: Circumflex Branch Of Left Coronary Artery, Left Coronary Artery, Coronary Artery Disease

• School: Brock University
• Department: Health Sciences
• Course: HLSC 1F90
• Professor: Kelli-an Lawrance

Document Summary

Cardiac anatomy: located in the mediastinum (middle of thorax, top of heart -> upper right chest, below second rib and right of sternum, apex -> lies just above diaphragm. Apex (most narrow part of heart), base widest part of heart (at top) Clicker question: which chamber receives deoxygenated blood from the periphery. Heart valves: passive movement of blood, prevent back flow of blood, unidirectional movement of blood, two types, atrioventricular (separate atria and ventricles, semilunar (separate ventricles and arteries) Atrioventricular valves: tricuspid between right atrium and ventricle, bicuspid (mitral) - between left atrium and ventricle. (have two leaflets) Semilunar valves: valves between right ventricle and pulmonary artery and left ventricle and aorta, composed of three cup-like cusps (pockets) attached to valve rings. Impulse conduction: sa node -> av node (what comes into the heart comes out of it, bundle of his, left branch bundle, right branch bundle, purkinje fibers.