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Transcript
Objectives To introduce the heart - amazing facts - functions - gross anatomy Amazing Facts Most featured human organ in literature! Approximately fist shaped. 2/3rds of its mass is towards the left of midline. Apex points to the left hip. 1/20 of the blood supply used to nourish the heart Heart pumps 2000 gallons of blood per day. Cardiac muscle is myogenic. Introduction to the Heart Anatomy & Location in the mediastinum (medial to lungs) Function: To pump the blood through the circulatory system. A double pump system. - Pulmonary - Systemic Coverings Layers of the Heart I. Pericardium A. Fibrous B. Serous i. Parietal ii. Visceral II. Pericardial Cavity – space between parietal and visceral layers to reduce friction. Epicardium (outer) II. II. Myocardium (major) III. Endocardium (inner) I. 1 Know your Valves Chambers of the Heart Atria = “entryway” Receive vessels flowing into H. Thinner walled – less muscular Ventricles – “underside” Vessels flow out of H. More muscular (left 3x’s thicker than right) Between chambers: o Tricuspid (Right) o Mitral (Left) Semi-lunar: SemiPulmonary o Aortic o Atrioventricular groove separates the atria from the ventricles. [Externally] Atria separated by interatrial septum Ventricles separated by interventricular septum Flow of Blood through the Heart pg 66-12 > Right Atrium > Tricuspid valve > R. ventricle > Pulmonary, semisemi-lunar valve > Pulmonary arteries >Lungs > Pulmonary veins > Left atrium > Bicuspid valve >Left ventricle > Aortic semisemi-lunar valve > Aorta 2