Place the following statement in the correct order as they happen during normal physiology

1. O2 and carbon dioxide are exchanged.
2. Blood is pumped from the right side of the heart to the lungs.
3. The heart pumps oxygenated blood to the major organs and tissues.
4. Blood is returned to the left side of the heart.
a. 1, 2, 3, 4
b. 2, 1, 4, 3
c. 4, 3, 1, 2
d. 3, 4, 2, 1

ANS: B
During normal circulation blood is pumped from the right side of the heart to the lungs where O2 and carbon dioxide are exchanged. From the lungs, blood is returned to the left side of the heart. The left heart then pumps oxygenated blood to the major organs and tissues.