Which of the following would not result in the dilation of the terminal arterioles and upstream arterioles in systemic capillary beds? a. a decrease in local tissue O₂ content, b. an increase in local tissue CO₂, c. a local increase in histamine, d. a local increase in pH.

Video transcript

Hey, everyone. Let's take a look at this question together which of the following best describes the purpose of dilation of the terminal arterials and upstream arterials in systemic capillary beds. Is it answer choice A to increase blood flow and deliver more oxygen and nutrients to tissues? Is it answer choice B to reduce blood flow and conserve oxygen and nutrients in tissues. Answer choice C to promote blood clot formation and prevent excessive bleeding or answer choice D to regulate body temperature by dissipating excess heat from tissues. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer. So, looking at our question, we are trying to figure out which of the following best describes that purpose of dilation of the terminal arterials and upstream arterials. And we know that when those arterials dilate the resistance to blood flow decreases, since dilation leads to the widening of those capillary beds and it allows a larger volume of blood flow into the capillaries. And when there is a larger blood volume, it leads to an increase in the delivery of oxygen and nutrients to the tissues, which means that when the arterials dilate, there is more oxygen and nutrients delivered to the tissues. So the purpose of dilation of those terminal arterials and upstream arterials in systemic capillary beds is answer choice A to increase blood flow and deliver more oxygen and nutrients to the tissues. Since answer choice A is result of the dilation of those arterials. Whereas answer choice B is a result of the constriction of those arterials. And answer choice C is incorrect. Since answer choice C is not related to the dilation of the arterials. And answer choice D is incorrect. Since the systemic capillary beds are not involved in thermal regulation. I hope you found this video to be helpful. Thank you and goodbye.