ANATOMY OF HEART NOTES HEART CHAMBERS Atria receiving

ANATOMY OF HEART NOTES

HEART CHAMBERS • Atria - receiving chambers • Left atrium – receives blood from lung • Right atrium – receive blood from the rest of body

• Ventricles - discharging chambers • Right ventricle – discharges blood to lungs • Left ventricle – discharges blood to the rest of body

CIRCULATIONS • Pulmonary circulation • flow of blood to and from lungs to heart • Systemic circulation • flow of blood from rest of the body to the heart

• Coronary Circulation • Flow of blood to myocardium of heart • Coronary arteries – supplies blood to the heart • Cardiac veins – carries blood away from the heart • Blood empties into the right atrium via the coronary sinus

HEART VALVES · Atrioventricular valves (AV valves) – between atria and ventricles • Bicuspid (Mitral) valve (left) • Tricuspid valve (right)

• Semilunar valves – between ventricle and artery • Pulmonary semilunar valve – between right ventricle and pulmonary trunk • Aortic semilunar valve – between left ventricle and Aorta

• Valves open as blood is pumped through • Held in place by chordae tendineae (“heart strings”) –anchors valves to ventricular wall • Close to prevent backflow • Blood flow in only one direction

MAJOR VESSELS OF HEART • Aorta – leaves left ventricle to rest of body • Pulmonary trunk – leave right ventricle to lungs branch into pulmonary arteries

• Vena cava (superior and inferior) – enters right atrium from upper and lower parts of body • Pulmonary veins (four) – enter left atrium from lungs