The left ventricle has a more muscular wall than the other three chambers of the heart because the left ventricle: A) houses the pacemaker of the heart. B) must generate enough force and blood pressure to pump blood into the aorta. C) must decrease the amount of pressure on the blood so it can flow more smoothly through the atria. D) pumps blood more slowly than the other chambers. E) receives blood directly from major arteries.

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The answer is that the left ventricle must generate enough force and blood pressure to pump blood into the aorta.  It's job is to receive oxygenated blood from the left atrium and pump it to the aorta, through the aortic valve. The thicker and more muscular walls allow it to...

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The answer is that the left ventricle must generate enough force and blood pressure to pump blood into the aorta.  It's job is to receive oxygenated blood from the left atrium and pump it to the aorta, through the aortic valve. The thicker and more muscular walls allow it to pump blood at a higher pressure to the aorta. This will then transport the oxygenated blood to various arteries that branch off the aorta, to carry the oxygenated blood to all parts of the body. To function properly, it relaxes quickly after each contraction so that it can rapidly fill with oxygenated blood that is transported by the pulmonary veins to the left atrium.

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