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?
A
They need more oxygen to function, so gas exchange needs to decrease.
B
They need more oxygen to function, so gas exchange needs to increase.
C
They need more carbon dioxide to function, so gas exchange needs to increase.
D
They need more carbon dioxide to function, so gas exchange needs to decrease.