Your heart is a very remarkable organ. It beats 100,000 times daily throughout your life, expanding and contracting through a considerable range of size with each beat. This is punishing enough for the muscle of your heart, but consider the amazing resilience of the thin glistening skin which lines the chambers of your heart and the walls of all your arteries in one seamless streamlined sheet. This too is being stretched and crumpled 100,000 times every day - treatment no plastic or leather would stand up to for seven days, never mind seventy years!
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