Internal respiration depends on the amount of .......... in blood and .......... in tissues.
A
Oxygen, carbon dioxide
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B
Carbon dioxide, oxygen
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C
Oxygen, enxymes
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D
None of the above
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Solution
The correct option is A Oxygen, carbon dioxide Internal respiration is also called as tissue respiration or peripheral gas exchange. The exchange of oxygen and carbon dioxide between blood and cells in different tissues is called internal respiration. Internal respiration occurs in the peripheral metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the tissues.