Q. 584.2( 5 Votes )

Internal respiration may be defined as:
A. breathing in and releasing of oxygen in the tissue

B. the oxidation of food substances to release energy

C. the building up (synthesis) of complex substances

D. getting rid of carbon dioxide that would accumulate in the tissues.

Answer :

Internal respiration is the exchange of gases between body cells and blood to oxidize food substances to release energy.

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