Answer:
The main function of the pulmonary alveoli is to perform the transfer and exchange of gases. In this case, the following gases are included: oxygen, carbon dioxide and gases. Of the elements listed, the only one that is not transferred by the alveoli is the blood.
Explanation:
The importance of this compartmental arrangement is the fact that the mediastinum region of the body houses essential organs. The region contains the thymus, pericardial cavity, trachea, esophagus and major blood vessels. The separation provides these body parts with a barrier of tissues. The mediastinum also separates one lung from the other. This is functionally important as it allows one lung to work independently of the other in cases where one may be diseased or injured.
The controlled variable is an element that is not changed throughout an experiment, because it’s unchanging state allows the relationship between the other variables being tested to be better understood.
