What is the exchange of gases between the lungs and the blood?

A. Internal respiration
B. Posterior respiration
C. External respiration
D. None of the above
i'm lost please help me.

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So is it D?

yes, D

To determine the correct answer, let's break down the question and the options one by one.

The question asks about the exchange of gases between the lungs and the blood. This refers to the process by which oxygen from the air we breathe enters the bloodstream and carbon dioxide, a waste product, is removed from the bloodstream and exhaled from the body.

Now, let's look at the options:

A. Internal respiration: This term refers to the exchange of gases between cells and tissues within the body. It does not specifically address the exchange of gases between the lungs and blood, so we can eliminate this option.

B. Posterior respiration: The term "posterior" typically refers to the back of something. Respiration, however, is not a term used to describe the exchange of gases between the lungs and blood. So, we can eliminate this option as well.

C. External respiration: This term specifically refers to the exchange of gases between the lungs and the blood. During external respiration, oxygen from the inhaled air enters the bloodstream through the walls of the alveoli (tiny air sacs in the lungs), while carbon dioxide passes from the blood into the alveoli to be exhaled. Therefore, this option is the correct answer.

D. None of the above: Since option C, which is "external respiration," is the correct answer, we can eliminate this option.

In conclusion, the correct answer to the question "What is the exchange of gases between the lungs and the blood?" is C. External respiration.