Question Detail
Question
The respiratory system is essential for providing ______ needed for cellular functions and removing ______ a waste product of metabolism.
Correct Answer
Option C is the correct answer.
Detailed Explanation
The primary function of the respiratory system is to take in oxygen, which is essential for cellular respiration and energy production, and to expel carbon dioxide, a waste product of metabolism.
Hint
Think about the gases involved in breathing and cellular energy.