Local Control of Blood Flow

Local control of blood flow

A) occurs because of contraction or relaxation of precapillary sphincters.
B) causes precapillary sphincters to contract when carbon dioxide levels decrease in tissue spaces.
C) causes an increase in blood flow when oxygen levels increase in tissue spaces.
D) Occurs because of contraction or relaxation of precapillary sphincters and causes an increase in blood flow when oxygen levels increase in tissue spaces are both true statements.
E) All of these are true statements.