Question

2. Which of the following explains one way that breathing and cellular respiration are connected? (1 point) Breathing supplies the carbon dioxide used in respiration. Breathing supplies the oxygen used in respiration. Respiration removes the harmful carbon dioxide that is produced from breathing. Respiration supplies the oxygen used in breathing.

Answer 1

Cellular *respiration* converts sugar and oxygen to water and carbon dioxyde: \[C_{6}H_{12}O_{6} + 6(O_{2}) \rightarrow 6(H_{2}0) 6(CO_{2}\]*Breathing* (i.e. the movement of your diaphragm to move air in and out of your lungs) provides fresh air with - relatively speaking- much oxygen and little to none carbon dioxide to the lungs; so oxygen can diffuse into the blood (because the blood contains less) and carbon dioxide can diffuse from the blood into the lungs (because there is some in the blood and almost none in the lungs). Which means that the correct answer is: Breathing supplies the oxygen used in respiration.