The ventricles of the mammalian heart have thicker muscular walls than the auricles because the

Assessment: WAEC SSCE - Biology - 2006 (Objective) Subject: Biology

Question 1 Report

The ventricles of the mammalian heart have thicker
muscular walls than the auricles because the
Answer Details
The ventricles of the mammalian heart have thicker muscular walls than the auricles because the ventricles pump blood to longer distances. The heart has four chambers, two atria (auricles) and two ventricles. The atria receive blood and then pass it to the ventricles. The ventricles pump blood to the entire body and the lungs. Since the ventricles pump blood to longer distances, they need more forceful contractions, which require more muscular tissue. This explains why the ventricles have thicker muscular walls than the atria.
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