Question

kristen is running a half marathon. by her tenth minute of running, her breathing rate has increased from her resting rate. which statement best describes how her tissues are responding to her running? they need more oxygen to function, so gas exchange needs to decrease. they need more oxygen to function, so gas exchange needs to increase. they need more carbon dioxide to function, so gas exchange needs to increase. they need more carbon dioxide to function, so gas exchange needs to decrease.

Explanation:

When running, the body's cells need more energy. Cellular respiration, which requires oxygen, is the process that provides this energy. To get more oxygen (and expel more carbon dioxide), gas exchange (in the lungs) needs to increase.

Answer:

They need more oxygen to function, so gas exchange needs to increase.