Question

Internal respiration may be defined as:

• A. getting rid of carbon dioxide that would accumulate in the tissues
• B. the oxidation of food substances to release energy
• C. the building up (synthesis) of complex substances
• D. breathing in and releasing oxygen in the tissue

Answer 1

The correct option is B the oxidation of food substances to release energy

Correct answer: (b) the oxidation of food substances to release energy
Internal respiration may be defined as the exchange of respiratory gases (oxygen and carbon dioxide) between the blood and the body cells for the oxidation of food substances to release energy.
Internal respiration is also called cellular respiration.