The fact that the left ventricular wall is thicker than the right reveals that it a. pumps a greater volume of blood, b. pumps blood against greater resistance, c. expands the thoracic cage, d. pumps blood through a smaller valve.

Video transcript

Welcome back. Here's our next question. Which of the following statements is true regarding the thickness of ventricular walls. A, the right ventricular wall is thicker than the left ventricular wall. B, the left ventricular wall is thicker than the right ventricular wall. Choice C, both ventricular walls have equal thickness or d. The thickness of ventricular walls varies based on the individual's blood type. Well, also we can eliminate choice d right away blood type doesn't have anything to do with the thickness of ventricular walls. And we think about the two different ventricles. We'd want to recall that the right ventricle pumps blood primarily to the lungs. So all right, pumps two lungs while the left ventricle pumps to the entire rest of the body, what prompts your entire body? So if you think about the strength of the muscle contractions needed in the different ventricles, the left ventricle needs to be thicker because it needs stronger contractions to pump throughout the body versus just to the lungs. And indeed, the, our answer here will be choice B, the left ventricular wall is thicker than the right ventricular wall. So we can rule out choice. A the right is definitely not thicker. And choice C both ventricular walls have equal thickness because again, that left ventricle has to pump more blood farther and therefore is thicker. So choice B left ventricular wall is thicker than the right ventricular wall is our true statement. See you in the next video.