So that means because of epinephrine, the blood can get to our tissue faster and more blood can get to those tissues. Now, what this also does is it increases the rate of respiration so that we breathe more and more oxygen basically gets to our tissues. Now, epinephrine also increases the breakdown of glycogen inside our liver cells into glucose so that we have more glucose in our blood readily available to be used by our cells of the body to create ATP for energy. And it also dilates blood vessels as well as constrict other blood vessels. And the net result is more blood flows into our skeletal muscle as well as our brain, and less muscle and less blood flows into certain internal organs, such as our digestive system. Now, norepinephrine is the hormone that is used to basically constrict our blood vessels, and that means that increases the blood pressure inside our blood vessels.