The baroreceptors in the carotid sinus and aortic arch are sensitive to a. a decrease in CO₂ , b. changes in arterial pressure, c. a decrease in O₂, d. all of these.

Video transcript

Hey, everyone. Let's take a look at this question together. When barrow receptors detect an increase in blood pressure, they initiate a response to what is it? Answer choice a increase heart rate and dilate blood vessels. Answer choice B decrease heart rate and constrict blood vessels. Answer choice C increase heart rate and constrict blood vessels or answer choice D decrease heart rate and dilate blood vessels. Let's work this problem out together to try to figure out which of the following answer choices is the response that beer receptors initiate when they detect an increase in blood pressure. So we can recall that barrow receptors are the meca receptors that are involved in detecting a change in blood pressure. And when the barrow receptors detect an increase in blood pressure, they initiate a response in order to lower that blood pressure. So they want a decrease in blood pressure. And there are two ways that the beer receptors initiate a response to get that decrease in the blood pressure. And the first is reducing the heart rate, which helps reduce the force that the heart pumps the blood leading to a decrease in cardiac output. And a decrease in blood pressure. And the other way that the beer receptors initiate a response to decrease the blood pressure is by increasing blood flow through the blood vess, which is called vasodilation. And this is done by widening those blood vessels allowing more blood flow through the blood vessels, which leads to that decrease in blood pressure. So, the barre receptors, when they detect an increase in blood pressure, initiate a response to decrease blood pressure by reducing the heart rate and through vasodilation or the dilation of the blood vessels. Which means that answer choice, d decreased heart rate and dilate blood vessels is the correct answer. Since a decrease in heart rate and the dilation of blood vessels will lead to a decrease in blood pressure. I hope you found this video to be helpful. Thank you and goodbye.