To stay alive, every cell in the body needs oxygen and nutrients. The , powered by the heart, pumps roughly 2,000 gallons of blood daily through 60,000 miles of blood vessels.
The , starring the two bean-shaped kidneys, is the body's master filter. Every day, the kidneys process about 180 quarts of blood, removing toxic waste like urea to produce urine. This delicate balance of water, salts, and acids is essential for homeostasis —the body's ability to maintain a stable internal environment despite external changes. The Human Body
If the skeleton is the framework and the muscles are the engine, the cardiovascular system is the fuel line. It is the transport network of the body, a vast highway system spanning over 60,000 miles of blood vessels. To stay alive, every cell in the body
The is the body’s refinery. It breaks down the food we eat into glucose, amino acids, and fats—the fuel our cells need to function. Starting from the mouth and ending at the small and large intestines, this system ensures that nutrients are absorbed efficiently. Every day, the kidneys process about 180 quarts
It traces the human life cycle from conception and birth to old age and death [10, 13].