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Welcome! Today we are going on a journey inside ourselves to see how the human body works like an incredibly organized team.
Just like a house is built from individual bricks, your body is built from tiny living building blocks called cells. Cells of the same type group together to form tissues, which then team up to build your organs.
Your heart is a powerful muscular organ that acts like a pump. It beats constantly to push blood through a network of tubes called blood vessels, delivering oxygen to every single part of your body.
Your lungs are the organs responsible for breathing. When you inhale, your lungs expand to take in oxygen, and when you exhale, they contract to push out a waste gas called carbon dioxide.
Trace the path of oxygen from the air you breathe to the cells in your body.
- 1. You inhale air through your nose or mouth, and it travels down your windpipe.
- 2. The air enters your lungs, where oxygen is absorbed into your bloodstream.
- 3. Your heart pumps this oxygen-rich blood out to the rest of your body.
- 4. The blood vessels deliver the oxygen directly to your hungry cells so they can make energy.
