Heart Valves Anatomy & Physiology PDF

Anatomy of the Heart 2 Heart valves, internal features & blood flow through the heart Niggy Gouldsborough  Fibrous Skeleton of the Heart Bands of fibrous connective tissue between the atria and ventricles Electrically separates the atria fro...

Anatomy of the Heart 2 Heart valves, internal features & blood flow through the heart Niggy Gouldsborough  Fibrous Skeleton of the Heart Bands of fibrous connective tissue between the atria and ventricles Electrically separates the atria from the ventricles (Ashton, 2015) Encircles the pulmonary trunk and aorta Heart valves suspended from it  Heart valves One-way valves that prevent backflow of blood pulmonary Atrioventricular (AV) valves aortic - Tricuspid (right AV valve) - Bicuspid/mitral (left AV valve) Semilunar valves - Pulmonary bicuspid (Ashton, 2015) tricuspid - Aortic (Ashton, 2015)  Heart Valves pulmonary trunk & aorta arteries superior vena pulmonary veins cava inferior right atrium left atrium vena cava tricuspid (right bicuspid (mitral/left AV) AV) valve pulmonary aortic valve semilunar valve semilunar valve right ventricle left ventricle  Atrioventricular valves Located between the atria and ventricles Opened by the blood flowing from atria to the ventricles Anchored by chordae tendinae to papillary muscles chordae tendinae Contraction of papillary muscles prevents eversion of the valves and therefore backflow of blood into the atria tricuspid mitral papillary valve valve muscle  Atrioventricular valves Chordae Papillary tendineae muscle A Open when ventricular V pressure is less than atrial pressure A Closed when Ventricular V pressure is greater than atrial pressure  Semilunar Valves Guard the entrances of the aorta and pulmonary trunk Opened by the force of blood as the ventricles contract Blood flows backwards in the aorta and pulmonary trunk during ventricular relaxation, this pools in the cusps and pushes them shut Prevent backflow of blood into the ventricles pulmonary aortic valve valve Internal Features of The Heart aortic valve pulmonary valve left atrium right atrium bicuspid valve left ventricle tricuspid valve chordae tendinae right ventricle papillary muscle trabeculae carnae ventricular septum (Ashton, 2015) Blood flow through the heart aorta to systemic circulation pulmonary arteries to lungs pulmonary veins from lungs IVC & SVC from systemic circulation LA RA tricuspid valve bicuspid valve aortic valve pulmonary valve RV LV