Explain the process of diffusion in the alveoli and how the alveoli are adapted to their function.
Answers
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.
You have about 480 million alveoli, located at the end of bronchial tubes. 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:
Explanation:
When air is inhaled, oxygen diffuses from the alveoli into the blood to be used for respiration by the body’s cells.
Carbon dioxide is a waste product made by the body’s cells during respiration.
It diffuses from the blood into the alveoli and is exhaled.
Adaptations of the alveoli:
Large surface area - many alveoli are present in the lungs with a shape that further increases surface area.
Thin walls - 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.
Permeable walls - allow gases to pass through.
Extensive blood supply - ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
A large diffusion gradient - breathing ensures that the oxygen concentration in the alveoli is higher than in the capillaries so oxygen moves from the alveoli to the blood. Carbon dioxide diffuses in the opposite direction.