Answer:
According to the image that represents a cell in the human body, the true statement is that structure 4 is the cell membrane that provides exchange of O₂ & CO₂.
Explanation:
In cells, the cell membrane acts as a semi-permeable barrier to the passage of substances, including nutrients and oxygen (O₂).
One of the functions of the cell membrane is to allow the exchange of O₂ —necessary for the cell— and carbon dioxide (CO₂), a product of cell metabolism that must be removed.
In the image, the structure identified with the number 4 corresponds to a cell membrane of human cells that provides this gas exchange.
The other options are not correct because:
- <em>Structure 1 is a ribosome, not a </em><u><em>chloroplast</em></u><em>.
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- <em>Structure 2 is the nucleus, not a </em><u><em>vacuole containing DNA</em></u><em>.
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- <em>Structure 3 is a </em><u><em>mitochondria</em></u><em>, but protein synthesis does not occur there.</em>
