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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
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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

User Umar Abdullah
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2 votes

Answer:

a

Step-by-step explanation:

User Sulav Timsina
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