Question

which of the following will increase the heart rate? multiple choice an increase in the level of blood oxygen an increase in blood pressure a rise in ph a decrease in the level of carbon dioxide in the blood an increase in the level of carbon dioxide in the blood

Explanation:

An increase in the level of carbon dioxide in the blood (hypercapnia) stimulates the respiratory and cardiovascular centers. This leads to an increase in heart rate as the body tries to improve gas - exchange and oxygen delivery. An increase in blood oxygen generally decreases heart rate, an increase in blood pressure usually leads to a reflex decrease in heart rate (baroreceptor reflex), a rise in pH (alkalosis) can decrease heart rate, and a decrease in blood carbon - dioxide (hypocapnia) also tends to decrease heart rate.

Answer:

An increase in the level of carbon dioxide in the blood