Local control of blood flowMultiple ChoiceAll of the choices are correct.Both "occurs because of contraction or relaxation of precapillary sphincters" and "causes an increase in blood flow when oxygen levels increase in tissue spaces" are correct.occurs because of contraction or relaxation of precapillary sphincters.causes precapillary sphincters to contract when carbon dioxide levels decrease in tissue spaces.causes an increase in blood flow when oxygen levels increase in tissue spaces.
Question
Local control of blood flowMultiple ChoiceAll of the choices are correct.Both "occurs because of contraction or relaxation of precapillary sphincters" and "causes an increase in blood flow when oxygen levels increase in tissue spaces" are correct.occurs because of contraction or relaxation of precapillary sphincters.causes precapillary sphincters to contract when carbon dioxide levels decrease in tissue spaces.causes an increase in blood flow when oxygen levels increase in tissue spaces.
Solution
The correct answer is "occurs because of contraction or relaxation of precapillary sphincters." This is because local control of blood flow is primarily regulated by the contraction and relaxation of precapillary sphincters, which are rings of smooth muscle that surround the entrance to capillaries. These sphincters can constrict or dilate to control the amount of blood that flows into the capillaries. The other options are incorrect because blood flow increases when oxygen levels decrease (not increase) in tissue spaces, and precapillary sphincters contract when carbon dioxide levels increase (not decrease) in tissue spaces.
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