are lungs made up of alveoli
Lung Anatomy. The lungs are made up of millions of tiny balloons called alveoli, which fill with air each time you inhale and deflate each time you exhale. The many microscopic alveoli make the lungs look like sponges.Alveoli are made up of squamous epitheliel tissue, which is very thin and elastic, like the walls of a balloon.ung Anatomy. The lungs are made up of millions of tiny balloons called alveoli, which fill with air each time you inhale and deflate each time you exhale. The many microscopic alveoli make the lungs look like sponges.