The respiratory system can regulate the pH level of the bâ¦lood by the depth and rate of ventilation. By increasing the rate and depth of ventilation, the respiratory system will decrease the amount of CO2 in the blood which will decrease the amount of carbonic acid in the blood. That will increase the blood pH.
Definition of Adverb: Most often, adverbs modify verbs. When adverbs modify verbs, they describe the verb, much like an adjective modifies or describes a noun. Here are a few adverb examples. David quickly walked.
An adverb, on the other hand, is a type of word or part of speech. We can say that an adverb may serve as an adverbial, but an adverbial is not necessarily an adverb. (M. Strumpf and A. Douglas, The Grammar Bible.