How can the heart pump blood both hard enough to get all the way around the body, but not so hard that it doesn't blow out the fragile lung tissue?

Name: How can the heart pump blood both hard enough to get all the way around the body, but not so hard that it doesn't blow out the fragile lung tissue?
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The Answer of How can the heart pump blood both hard enough to get all the way around the body, but not so hard that it doesn't blow out the fragile lung tissue?

How Can the Heart Pump Blood Both Hard Enough to Get