Question

What are alveoli? Write about it's characteristics

Answer 1

Explanation:

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. You have about 480 million alveoli, located at the end of bronchial tubes.

Answer 2

Alveoli:

• Alveoli are structural and functional unit of lungs.

• Alveoli are rich in blood vessels.

• Alveoli always remain moist for efficient gaseous exchange.

• Alveoli consists of two types of cells.

• The cells of alveoli are called pneumocytes.

• Pneumocyte I is smaller than Pneumocyte II

• Pneumocyte I helps in gaseous exchange.

• Pneumocyte II of alveoli secretes Lecithin.

• Lecithin reduces surface tension of alveoli.

• Alveoli always remain open for gaseous exchange.

• In human total 300 millions alveoli are present.

• Alveoli has yellow fibrous connective tissue.