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What are the modes of exchange of gases ...

What are the modes of exchange of gases `(O_2 and CO_2)` at the level of alveoli and tissue respectively ?

A

Active transport, active transpot

B

Diffusion, diffusion

C

Diffusion, active transport

D

Active transport, diffusion

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question regarding the modes of exchange of gases (O₂ and CO₂) at the level of alveoli and tissue, we need to understand the processes involved in gas exchange in both locations. ### Step-by-Step Solution: 1. **Understanding Gas Exchange in Alveoli**: - In the alveoli, oxygen (O₂) from the air enters the bloodstream, while carbon dioxide (CO₂) from the blood is expelled into the alveoli to be exhaled. This exchange occurs due to the difference in concentration gradients. - The process is driven by **diffusion**, where gases move from an area of higher concentration to an area of lower concentration. In this case, O₂ moves from the alveoli (high concentration) into the blood (low concentration), and CO₂ moves from the blood (high concentration) into the alveoli (low concentration). 2. **Understanding Gas Exchange in Tissues**: - In the tissues, the process is similar. Oxygen (O₂) is delivered from the blood to the tissues, and carbon dioxide (CO₂) produced by cellular metabolism is transported back to the blood. - This exchange also occurs via **diffusion**. O₂ diffuses from the blood (high concentration) into the tissues (low concentration), while CO₂ diffuses from the tissues (high concentration) into the blood (low concentration). 3. **Conclusion**: - Both the exchange of O₂ and CO₂ at the level of alveoli and tissues occurs through **diffusion**. Therefore, the correct answer is that the mode of exchange of gases at both the alveoli and tissue levels is **diffusion**. ### Final Answer: The modes of exchange of gases (O₂ and CO₂) at the level of alveoli and tissue respectively are **diffusion** for both.
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