The human body contains approximately 6 quarts (5.6 liters) of blood. Blood acts as your body’s transportation system in one day, your blood travels nearly 12,000 miles (19,312 kilometers). Pumped along by your heart, blood brings oxygen from the air you breathe and nutrients from the food you eat to all the cells of your body. (Your heart pumps 1 million barrels of blood during your lifetime enough to fill three supertankers.) Blood also keeps cells clean and healthy by taking waste products away after the nutrients and oxygen have been used for processes like growth and repair. In addition, blood transports hormones chemicals made in glands that control a variety of processes throughout your body. Blood also carries heat throughout your body.
- What is DNA?
- Why are cells called building blocks?
- How big will I become?
- How do I grow?
- How did my life begin?
- How is the human body a living machine?
- What causes growing pains?
- What’s a charley horse?
- Which states are the biggest farm states?
- Is it easier for my face to laugh or frown?
- Which muscles are the largest, and which ones are the smallest?
- What’s an Achilles heel?
- What are muscles made of?
- Why do my knuckles sometimes make a cracking sound if I bend them?
- How is the body able to bend?
- Is there such a thing as a funny bone?
- Where is my spine?
- Where is my rib cage?
- Which are the biggest and smallest bones?
- How has farming changed in the United States?
