Question

The surface area of lungs is increased by *​

Answer 1

Answer:

Large surface area - many alveoli are present in the lungs with a shape that further increases surface area. Thin wall - alveolar walls are one cell thick providing gases with a short diffusion distance . Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface.

Explanation:

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Answer 2

By expanding the surface area of the lungs, alveoli the lungs promote gas exchange.

About Lungs:

• The lungs are two spongy, air-filled organs that are positioned on either side of the chest (thorax).
• The trachea (windpipe) transports breathed air to the lungs via tubular branches known as bronchi.
• The bronchi split further into smaller and smaller branches (bronchioles), eventually becoming tiny.

About alveoli:

• The alveoli are the spaces between the lungs and the blood where oxygen and carbon dioxide are exchanged throughout the breathing in and out process.
• Breathing in oxygen from the air causes it to move via the alveoli, into the blood, and then to the tissues throughout the body.
• An alveolus is made up of a simple squamous epithelial layer (extremely thin, flattened cells) and an extracellular matrix surrounded by capillaries.
• The epithelial lining is a component of the alveolar membrane, also known as the respiratory membrane, which permits gases to exchange.

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