Final answer:
Respiratory rate and depth can be controlled by both the medulla oblongata and higher brain centers for voluntary control.
Step-by-step explanation:
The statement is true. The levels of respiratory rate and depth can be controlled not only by the control centers in the medulla oblongata but also by higher brain centers for more voluntary control. For example, during activities like speech, diving, emotional reactions, and experiencing pain, the higher brain centers can modulate and influence the respiratory activity.