The ventricles of the mammalian heart are more museutam than the auricles because the ____________
A. auricles have smaller capacity B. ventricles are larger in size C. ventricles pump blood to distant organs D. ventricles receive more blood.
Correct Answer: C
Explanation
The muscular wall of the left ventricle is three times as thick as that of the right ventricle. This difference is due to the fact that the right ventricle only has to pump blood to the lungs which are very near the heart in the thorax, whereas the left ventricle pumps blood all round the body. Therefore, the blood entering the aorta from the left ventricle is at a much higher blood pressure than the blood entering the pulmonary artery. The ventricles are more muscular than the auricles because the ventricles pump blood to distant organs
