Arrange the sentences in order to describe how oxygen from air is transported to the cells in the kidneys. 1. the air diffuses into the capillaries surrounding the alveoli. 2. the pulmonary veins carry oxygenated blood to the heart. 3. air enters the bronchioles in the lungs and reaches the alveoli. 4. the capillaries join together to reach the arteries, transferring the oxygen. 5. the oxygen-rich blood moves from the aorta and reaches the kidneys through a series of blood vessels. 6. the left atrium fills with oxygen-rich blood and contracts to fill the left ventricle.

The order of the sentences should be:

3. Air enters the bronchioles in the lungs and reaches the alveoli.
1. The air diffuses into the capillaries surrounding the alveoli.
2. The pulmonary veins carry oxygenated blood to the heart.
6. The left atrium fills with oxygen-rich blood and contracts to fill the left ventricle.
5. The oxygen-rich blood moves from the aorta and reaches the kidneys through a series of blood vessels.
4. The capillaries join together to reach the arteries, transferring the oxygen.

The sentences are self-explanatory. Roughly the order would be: lungs, gas diffusion, left heart, kidney

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