Answer (b) Dilation, Pressure overload is
wrong.
You are correct in saying #3 is dilated. Its diameter is much increased from the other hearts shown. But pressure overload does not cause this. According to Laplace's law, dilation weakens the heart so it cannot generate pressure as well as a normal or hypertrophied heart. Eg. A thin dilated balloon is much easier to blow up (generates less pressure) than a thick small balloon.
Try again.
