Correctly order the steps to show how blood carries oxygen to the cells of your body and removes carbon dioxide as a waste product.
START ORDER
1. The heart pumps oxygen-containing blood throughout the body.

2. Oxygen is taken into the cells and carbon dioxide is released into the blood as a waste product.

3. Blood carries the carbon dioxide back to the lungs where it is exhaled.

4. Blood picks up oxygen in the lungs.
Answer the question by ordering it 1 to 4 when you answer