Which of the following would not result in the dilation of the feeder arterioles and opening of the pre capillary sphincter 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

Option (C).

Explanation:

The dilation of feeder arterioles carry blood directly into the blood vessels. The pre capillary sphincter in the systemic capillary beds can open due to the different factors.

The local release of histamines do not cause the dilation of feeder arterioles and does not cause the opening of systemic capillary beds. Histamine chemical is involved in the immune response of the body.

Thus, the correct answer is option (C).  

i am going to guess that it is co2.

not sure if this is what you'r looking for nnew= nold