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Brain and Cervical Spinal Cord A rear view of the skull reveals the brain and the cervical spinal cord, which function together as the central nervous system. The remarkable apparatus uses motor neurons to control the body's many muscles and enables humans to perform myriad physical activities
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Inside the Heart Tissue-paper thin but tough, the valves of the human heart open and close to pump 6 quarts (0.9 liters) of blood a day through 60,000 miles (97,000 kilometers) of vessels. That's equivalent to 20 treks across the United States from coast to coast. The heart is a magnificent machine when it's in good working order. But coronary heart disease is the number one killer of American men as well as women, resulting in 500,000 deaths in the United States and killing 7.2 million people worldwide each year
