Question

Identify the correct order of blood flow through the heart, entering from the vena cava.

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

Answer 1

Answer: (E)

Both vena cava passes the deoxygenated blood to the right atrium. Blood from right atrium enters right ventricle and pulmonary arteries carry deoxygenated blood from right ventricle to lungs for oxygenation. Two pulmonary veins come from each lung and pass O${}_2$-rich blood to left atrium. Blood enters left ventricle from the left atrium. The left ventricle pumps blood into the aorta which in turn branches and delivers blood to the major body regions and organs. So, the correct sequence is C.