Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: and procaine. Not only do catalysts greatly increase the rates of reactions, but in some cases such as in petroleum refining, they also control which products are formed. The acceleration of a reaction by a catalyst is called catalysis. Answer: reactions
[EX A]: Catalysts can greatly increase the rates of chemical what?

[EX Q]: Passage: Minerals form from dissolved substances when water evaporates. Answer: evaporation
[EX A]: What process does water undergo to leave behind dissolved substances?

[EX Q]: Passage: Neurons that innervate the muscles of the respiratory system are responsible for controlling and regulating pulmonary ventilation. The major brain centers involved in pulmonary ventilation are the medulla oblongata and the pontine respiratory group (Figure 22.20). Answer: neurons
[EX A]:
What basic structures of the nervous system innervate the muscles of the respiratory system and are responsible for controlling and regulating pulmonary ventilation?