As You Work Your Quads, You Notice That the Tissue

Multiple Choice

As you work your quads, you notice that the tissue in that part of the leg is pinker (flush with increased blood flow) . What has caused this increase in blood flow to the quads?

A) an increase in the oxygen concentration in the tissue.
B) an increase in carbon dioxide concentration in the tissue.
C) the constriction of precapillary sphincters in the capillary beds of the muscle.
D) the overall decrease in the temperature of the muscle tissue as the muscles contract.
E) a rise in the pH of the blood and interstitial fluid of the muscle.