Biology, 20.04.2021 06:30 ashiteru123

During normal breathing, what is the usual stimulus for a person to take a breath? a. a decrease in pH of the cerebrospinal fluid

b. stimulation by norepinephrine

c. PCO2 in the blood drops below 40 mmHg

d. PO2 in the blood drops below 100 mmHg

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During normal breathing, what is the usual stimulus for a person to take a breath? a. a decrease i...