Dr. David Menton. 2011. Answers in Genesis, 85 min.
The cardiovascular system (the heart and blood vessels) is the most vitally important organ system in the body. Your heart pumps blood, and your blood vessels channel and deliver nutrient-rich oxygenated blood throughout your body.
The heart is a pump about the size of your fist. In your lifetime, this little pump beats about 2 billion times (without stopping) and pumps over 100 million gallons of blood. This blood travels through over 60 thousand miles of blood vessels—arteries, arterioles, capillaries, and veins—to bring nourishment and oxygen to all parts of your body. You may be surprised to learn that the heart is actually two pumps: one pumps blood to the lungs and the other pumps blood to the rest of the body.
The Bible says the “blood is the life.” Indeed, our life critically depends on about 30 trillion blood cells consisting of red cells that exchange oxygen for carbon dioxide and white cells that help to prevent infection and reject foreign materials.