What happens to the rate of breathing during respiratory depression and how does this affect the concentration of $CO_2$ in the blood?
The patient is breathing too fast, so the concentration of $CO_2$ in the blood will decrease.
The patient is breathing too slowly, so the concentration of $CO_2$ in the blood will increase.
The patient is breathing too slowly, so the concentration of $CO_2$ in the blood will decrease.
The patient is breathing too fast, so the concentration of $CO_2$ in the blood will increase.