Final answer:
The statement is false as the dorsal respiratory group (DRG) contains primarily inspiratory neurons, influencing breathing rhythm by initiating inspiration.
Step-by-step explanation:
The statement that the dorsal respiratory group (DRG) contains both inspiratory and expiratory neurons that generate the rate of breathing is False. The DRG primarily contains inspiratory neurons that are responsible for maintaining a constant breathing rhythm through the stimulation of the diaphragm and intercostal muscles, promoting inspiration. Expiration occurs when the DRG's activity ceases, allowing these muscles to relax. In contrast, the ventral respiratory group (VRG) is involved in forced breathing and deals with both inspiratory and expiratory processes by stimulating the accessory muscles needed for forced inspiration and expiration.