Question

In the process of respiration, state the function of alveoli.​

Answer 1

Answer:

Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they're microscopic, alveoli are the workhorses of your respiratory system. ... When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli shrink to expel carbon dioxide.

Explanation:

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Answer 2

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Picture your lungs as two well-branched tree limbs, one on each side of your chest. The right lung has three sections (lobes), and the left lung has two sections (above the heart). The larger branches in each lobe are called bronchi.

The bronchi divide into smaller branches called bronchioles. And at the end of each bronchiole is a small duct (alveolar duct) that connects to a cluster of thousands of microscopic bubble-like structures, the alveoli.

The word alveolus comes from the Latin word for “little cavity.”

Alveoli in cross-section

The alveoli are organized into bunches, each bunch grouped is what’s called the alveolar sac.

The alveoli touch each other, like grapes in a tight bunch. The number of alveoli and alveolar sacs are what give your lungs a spongy consistency. Each alveolus (singular of alveoli) is about 0.2 millimeters in diameter (about 0.008 inches).

Each alveolus is cup-shaped with very thin walls. It’s surrounded by networks of blood vessels called capillaries that also have thin walls.

The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood. The carbon dioxide you breathe out is diffused from the capillaries to the alveoli, up the bronchial tree and out your mouth.

The alveoli are just one cell in thickness, which allows the gas exchange of respiration to take place rapidly. The wall of an alveolus and the wall of a capillary are each about 0.00004 inches (0.0001 centimeters).

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