What is the author’s purpose in discussing the mitral valve's responsibilities?

The purpose of discussing the mitral valve's responsibilities is primarily to convey the significance of its role in the circulatory system, particularly in terms of how it can experience stress due to its function. By focusing on the mitral valve's responsibilities, the author highlights the importance of this valve in regulating blood flow and preventing backflow, thus demonstrating its critical function in maintaining cardiovascular health. This emphasis on the demands placed on the mitral valve serves to underline both the necessity of its proper functioning and any potential consequences that arise from issues related to it. Recognizing the stress on the mitral valve allows readers to appreciate the complexities of the heart's anatomy and the importance of each component in overall health.