Air does not absorb xray beams, so areas filled with air, such as the bronchial tree, appear black in a CRX. Although the lungs appear somewhat black, there are a lot of white "streaks" within them. These streaks represent structures within the lungs, such as branches of the bronchial tree and pulmonary vessels. Notice that in a normal chest film, the right hemidiaphragm is slightly higher than the left hemidiaphragm.

Identify the following:

1. trachea

2. right lung

3. left lung

4. right hemidiaphragm

5. left hemidiaphragm

BONUS:

What do you think this is?