human gas exchange

Which one of the following is not a feature of all gas exchange surfaces?

• good blood supply

• thin surface

• presence of alveoli

• large surface area

label the the following parts on the diagram

1. 1. lungs 2. diaphragm,

   3. 3. ribs 4. intercostal muscles 5. larynx 6. trachea,

   4. 7. bronchi

   8. 8. bronchioles 9. alveoli

The two types of specialised cells in the trachea are ...............................and ...............................

The function of cartilage in the trachea is to provide structural ........ and maintain the ........... of the airway.

Draw an X on trachea , Y on bronchi and Z on bronchioles, A on diaphragm, B on ribs