Across
- 2. the trachea splits into two branches called ...
- 4. these are a pair of organs where air passes in and out of.
- 6. the type of blood vessel found in the lung tissue
- 8. the gas we exhale, which is produced in respiration.
Down
- 1. this is the scientific name of the windpipe.
- 3. the gas we breathe in, which is used for respiration.
- 5. the bronchi split into smaller tubes called ...
- 6. the substances that forms the trachea, bronchi and bronchioles.
- 7. these are the air sacs in the lungs and is where gas exchange takes place.