Tracheoles:

1. It is part of tracheal respiratory system in insects.

2. Fine intercellular tubes present deep into cells.

3. End blindly in cells.

ADVERTISEMENTS:

4. Filled with watery fluid at blind end.

Bronchioles:

1. It is part of respiratory system (lungs) in man.

2. These are not intercellular but they present in lungs.

ADVERTISEMENTS:

3. Branch further and end ultimately in alveolar sacs.

4. Not filled with watery fluid.