Final answer:
Alveoli are small sacs in the lungs where gas exchange takes place, allowing oxygen to enter the bloodstream and carbon dioxide to be removed. These structures have elastic walls and are connected by alveolar pores to aid in gas exchange efficiency.
Explanation:
Alveoli are tiny grape-like structures within the lungs responsible for gas exchange. They are located at the end of bronchioles and are the site of pulmonary gas exchange, where oxygen enters the bloodstream and carbon dioxide is removed.
The alveoli have elastic walls that allow them to stretch during air intake, maximizing the surface area available for gas exchange. They are interconnected by alveolar pores which help maintain equal air pressure within the lungs.
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