The atrioventricular valves seal by the surfaces of the flaps coming together- the edges of the flaps do not scrape against each other or against the walls of the
ventricles. Why is this frictionless way of closing, which doesn't cause any wear on
the valves, important?

True because all jobs are different and they all have chemicals that are for cleaning

Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )