Describe how air from the environment gets to the alveoli in our lungs. In your description link the structures to their functions. Go through the structures of the lungs and

state what their specific structure is and then what their functions are. For example, you should be discussing structures such as the trachea and its parts cilia, mucous and cartilage and what these do etc. Ensure that your answer includes all parts on the journey to the alveoli including the alveoli themselves. Clear linking of structure to function is important here. (Must be 300 words.)