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Why is the heart divided into two halves by a thick muscular wall?
 
a. A thick muscular wall divides the heart into two halves so that the septum separates the left and right ventricles, which pump blood to different body parts.
 
b. The right ventricle pumps oxygenated blood to the lungs, while the left ventricle pumps deoxygenated blood to the rest of the body.
 
c. Blood is circulated in both oxygenated and deoxygenated forms. So, the heart is divided into two halves by a thick muscular wall.