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"Did you know that there are around 60,000 miles (95,500 kilometers) of blood vessels in the human body? More than half of the body's blood is made of a substance called plasma. Discover more fascinating facts in How the Human Body Works - The Cardiovascular System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow...
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"Did you know that there are approximately 500 species of bacteria in the intestines? The surface area of the small intestine is 2,700 square feet (250 square meters). Discover more fascinating facts in How the Human Body Works - The Digestive System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function...
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"Did you know that there are more than 600 named muscles in the human body? The muscular system makes up about 50 percent of the body's weight. Discover more fascinating facts in How the Human Body Works - The Muscular System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book...
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"Did you know that about 20 percent of the body's energy is used by the brain? The average adult brain weighs 3 pounds (1.5 kilograms). Discover more fascinating facts in How the Human Body Works - The Nervous System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book explores...
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"Did you know that the average surface area of an adult's lungs is about 750 square feet (70 square meters)? The average adult takes 12 to 20 breaths per minute at rest. Discover more fascinating facts in How the Human Body Works - The Respiratory System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body...
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"Did you know that the largest bone in the human body is the femur? In adults, the skeleton makes up 15 percent of the body's weight. Discover more fascinating facts in How the Human Body Works - The Skeletal System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book explores...
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