Heart:

Rearrange the following order for the circulation of the blood starting from left atrium.

vena cava, left atrium, aorta, lungs, pulmonary artery, right atrium, pulmonary vein, right ventricle, left ventricle

The correct order is given below:

Lungs, Pulmonary vein, Left atrium, Left ventricle, Aorta, Vena cava, Right atrium, Right ventricle, Pulmonary artery.

Explanation: The deoxygenated blood carries by Vena cava to Right atrium, then the blood pumps to Right ventricle. From here, the blood is carried by an artery called

Pulmonary artery to the lungs. In lungs, oxygen is loaded into the blood and comes back to the heart by Pulmonary vein. The part of heart which collect the blood is called Left atrium and the blood is again pump into Left ventricle. And from heart the blood is carried by aorta to all parts of the body.