Question

The correct order of the flow of blood through the heart, entering from vena cava is

• A. Left atrium $\to$ left ventricle $\to$ right ventricle $\to$ right atrium
• B. Left ventricle $\to$ left atrium $\to$ right atrium $\to$ right ventricle
• C. Right atrium $\to$ right ventricle $\to$ left atrium $\to$ left ventricle
• D. Right ventricle $\to$ right atrium $\to$ left atrium$\to$ left ventricle
• E. Right ventricle $\to$ right atrium $\to$ left ventricle $\to$ left atrium

Answer 1

The correct option is C Right atrium $\to$ right ventricle $\to$ left atrium $\to$ left ventricle

Humans have double circulation: one is systemic circulation and other is pulmonary circulation. In systemic circulation, oxygenated blood moves from heart to all parts of the body. In pulmonary circulation, deoxygenated blood is pumped by heart to get oxygenated in lungs. All the deoxygenated blood from the body comes to the right atrium and it moves to the right ventricle from there and finally to the lungs carried by pulmonary trunk. From lungs, oxygenated blood enters left atrium to go to left ventricle to be carried by aorta to whole body. So, the correct answer is 'Right atrium$\to$ right ventricle $\to$ left atrium $\to$ left ventricle'