So here we have a pretty tricky example problem, but let's break it down and walk through it. So it says, which scenario results in dilation of arterioles and precapillary sphincters in mesenteric capillary beds? And we've got these 4 potential answer options down below. Now, we already know from our previous lesson videos that blood vessels can have the ability to vasoconstrict and vasodilate. And the vasoconstriction and vasodilation can effectively reroute the blood to other areas of the body where the blood may be needed more, where there's a greater demand for blood. And so here in this problem, it's mentioning the dilation of arterioles and precapillary sphincters in the mesenteric capillary beds. And so, the dilation of the arterioles will enlarge the diameter of these arterioles, and the dilation of the precapillary sphincters will relax the precapillary sphincters so that blood will rush into the capillary network of the mesenteries. And so, the dilation term here is suggesting that the mesenteries have a high demand for blood, that there's a great need for blood in the mesenteries. And so we need to choose one of these answer options that suggest that there is a great demand for blood in the mesenteries. And so, the first answer that we can eliminate right off the bat is answer option d, which suggests a greater need for blood elsewhere in the body other than the mesenteries. But again, if there was a greater need for blood elsewhere in the body, then we wouldn't expect the dilation of these things in the mesenteries because we would expect the constriction of these things because that would allow for blood to be rerouted to other areas of the body where there was a greater demand for the blood. And so, again, this is not the case. There is not constriction. The problem mentions the dilation, and so there's not a greater need for blood elsewhere in the body. In this particular scenario, this is not going to be the best answer, so we can eliminate answer option d. Now answer option b suggests that there is adequate oxygen gas concentration in the mesenteries. But if there is already adequate oxygen gas concentration in the mesenteries, then there's no need to dilate and allow more blood to rush to the mesenteries, and so answer option b is not going to be the best answer. So now we're between either answer option a or answer option c. And answer option c says that there's increased pH levels near the mesenteries. Now, an increased pH is correlated with lower metabolic activity, and so if there's lower metabolic activity, then there's not going to be a greater demand for blood. And so for that reason, we can eliminate answer option c since it's not the best answer here. And so this leaves answer option a as the only option, which is the correct answer, and it says increased CO₂ gas concentration in the mesenteries or increased carbon dioxide gas concentration in the mesenteries. Now, increased carbon dioxide gas is an indicator of greater metabolic activity. And if there is greater metabolic activity, then there's going to be a greater demand for blood. And that would be a scenario that we would expect the dilation of arterioles and precapillary sphincters in the mesenteric capillary beds. So answer option a is the best answer for this example problem, and that concludes this example, so I'll see you all in our next video.