2 / 2Which of the following would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds?choose one• a local increase in histamine• a local increase in pH• an increase in local tissue carbon dioxide• a decrease in local tissue oxygen content• a local increase in adenosine concentration
Question
2 / 2Which of the following would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds?choose one• a local increase in histamine• a local increase in pH• an increase in local tissue carbon dioxide• a decrease in local tissue oxygen content• a local increase in adenosine concentration
Solution
A local increase in pH would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds. This is because a higher pH indicates a more alkaline or less acidic condition, which is not a signal for these blood vessels to dilate or open. The other options listed - a local increase in histamine, an increase in local tissue carbon dioxide, a decrease in local tissue oxygen content, and a local increase in adenosine concentration - are all signals that the tissues need more blood flow, and would therefore cause dilation and opening to allow more blood to reach the tissues.
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