Alveoli are found on the end of bronchioles which is option C.
Alveoli are small air sacs found within the lungs that resemble a cluster of grapes. These are also known as pulmonary alveoli. They primarily stimulate gas exchange.
What is the function of alveoli?
- The alveoli are the final stage of the respiratory system, which begins when we inhale air via our mouth or nose.
- The oxygen-rich air passes via the trachea and into one of the two lungs through the right or left bronchus.
- Carbon dioxide molecules, produced as a byproduct of respiration, are diffused back to the alveolus and ejected from the body via the nose or mouth.
- Because the diaphragm contracts, creating negative pressure within the chest, alveoli expand during inhaling. Because the diaphragm relaxes during exhaling, the alveoli rebound (spring back).
Thus, we can conclude that option C is correct.
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