Best Human Circulatory System Notes for Class 12th Biology Students
Human Circulatory System Human Circulatory system consist of heart , blood vessles & blood. Heart is mesodermal in nature. It is situated in the thoracic cavity , in between the two lungs. The double membrane that surround the heart is known as Pericardium. Pericardium circles the pericardial luid. Heart is 4 chamber with 2 upper small atria & 2 lower long ventricles. A thin wall seperates the left & right atria called Intra-atrial septum . The left & the right ventricles are seperated by thick Intra-ventricular septum . The opening between the right atrium & right ventricles is guarded by a valve know as Tricuspid Valve . The Bicuspid Valve guards the opening between left atrium & left ventricles . The opening of right & left ventricles inton the pulmoery artry & the aorta. respectivelyare provided with the semilunalr valve. This valve in the heart allows...