Question

the respiratory center is stimulated if the:

A) ph of the blood goes above 7.41

B) amount of carbon dioxide in venous blood increases

C) amount of carbon dioxide in arterial blood decreases

D) Any of rhe above will stimulate the respiratory

Answer 1

• The respiratory center is stimulated when the concentration of the CO2 in the blood. That is the amount of the CO2 increase in the blood stimulate respiratory center, so the answer is option B.
• The increase in the CO2 level in the blood causes the pH to decrease thus decrease in the pH below 7.41 will stimulate the respiratory center that is below from the normal pH of the blood. Thus option A is wrong.
• The decrease in CO2 in blood will not stimulate the respiratory center but increase in the oxygen level of blood causes slight stimulation to the respiratory stimuli. Thus option C is wrong.
• Thus all together option D is wrong.