Part 1: The human respiratory system—of which the lungs are the largest component—is the most high-tech air purification and conditioning system on earth.
Part 2: The average person eats about 100,000 pounds of food during his lifetime. Have you ever considered what happens in the body to make use of all those grains, meats, and vegetables—plus all those fun sweets?
Part 1: The average person eats about 100,000 pounds of food during his lifetime. Have you ever considered what happens in the body to make use of all those grains, meats, and vegetables—plus all those fun sweets?
Part 1: 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.
