your hearts mitral valve does an awfully big job. letting blood from the left atrium of the heart into the…

your hearts mitral valve does an awfully big job. letting blood from the left atrium of the heart into the left ventricle without losing a drop is one of the toughest tasks in the circulatory system. in fact, if the system was suddenly opened at that point, the force of the valve closing would send blood five feet in the air.\nin this passage, the authors purpose is to\na describe the circulatory system.\nb convince readers of the stress on the mitral valve.\nc inform readers of defects in the mitral valve.\nd minimize the importance of the mitral valve.

your hearts mitral valve does an awfully big job. letting blood from the left atrium of the heart into the left ventricle without losing a drop is one of the toughest tasks in the circulatory system. in fact, if the system was suddenly opened at that point, the force of the valve closing would send blood five feet in the air.\nin this passage, the authors purpose is to\na describe the circulatory system.\nb convince readers of the stress on the mitral valve.\nc inform readers of defects in the mitral valve.\nd minimize the importance of the mitral valve.

Answer

Brief Explanations:

The passage emphasizes the critical role of the mitral valve: it enables blood flow between heart chambers, and losing its function would cause catastrophic circulatory failure. This highlights how essential the valve is to the circulatory system, matching the core intent of option B by stressing the valve's vital role (and thus the stress/importance of its proper function). Option A is too broad; the passage focuses on the valve, not the whole system. Options C and D are incorrect, as there is no mention of defects or minimizing importance.

Answer:

B. convince readers of the stress on the mitral valve.