Substances such as COÒ, lactic acid, adenosine, KÌ ions, and HÌ ions C
are all vasodilator substances and cause precapillary sphincters to contract.
are all vasoconstrictor substances and cause precapillary sphincters to contract.
are all vasodilator substances and cause precapillary sphincters to relax.
are all vasoconstrictor substances and cause precapillary sphincters to relax.
none of the above

[#FRAME:"TRM3S7A"]
NONE