Question

what are the characteristics of the alveolus as a respiratory surface

Answer 1

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alveoli are small balloon like structure present inside the lungs ......

Inside the lungs , bronchi divide many times into bronchioles . each bronchiole terminates into a sac called alveolar sac or alveoli ......

These are the actual sites of respiratory exchange .so , they are called functional units of lungs. tlThe wall of alveolar sac (plural : alveoli) is extremely thin and covered by network of blood capillaries. Respiratory gases are exchanged between the blood and alveolar sac by diffusion through alveolar wall.

These are approximately 300 - 700 Million alveoli in the lungs....................

The alveoli provide a large surface area for gaseous exchange. the total surface area is estimated to be 80m sq ........

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Answer 2

Answer:

• The walls of each alveolus are extremely thin and cup-shaped. Capillaries, a type of blood vessel with thin walls, form a network around it.
• The alveoli and capillaries in your body allow the oxygen you breathe in to diffuse into your blood. The capillaries, alveoli, bronchial tree, and mouth all participate in the diffusion of the carbon dioxide you exhale.
• Because the alveoli are only one cell thick, respiration's gas exchange can happen quickly. A capillary's wall and an alveolus' wall are both about 0.00004 inches thick (0.0001 centimeters).
• The air-blood barrier is made up of type 1 alveoli cells, which make up 95% of the alveolar surface.
• The surfactant that coats the interior surface of the alveolus and helps to lower surface tension is produced by type 2 alveoli cells, which are smaller. When you breathe in and out, the surfactant helps each alveolus maintain its shape.

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