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Watch and listen as David Menton explains the cardiovascular system in a highly entertaining 2-part lecture! In a lifetime, the heart beats about 2 billion times, pushing blood through over 60,000 miles of blood vessels to bring nourishment and oxygen to all parts of your body. The Bible says the "blood is the life." Discover how our life indeed critically depends on the 20 trillion blood cells that help to prevent infection and reject foreign materials. Part 1: 48 minutes. Part 2: 37 minutes. Teens & Adults. DVD.