Outside forces like stress or temperature change are constantly acting on us. How do our bodies remain stable internally while such external fluctuations are present? Hormones are what make it possible for our bodies to respond at any moment to changes that threaten our internal equilibrium.
Stress and Arousal
The origin of the word hormone comes from the Greek-literally meaning "to arouse". Hormones arouse cells by altering cellular activity, increasing or decreasing the rate of normal metabolic processes to help maintain homeostasis.
Since hormones govern processes like growth, reproduction and food use by cells, it follows that our bodys normal state of balance can be radically altered when hormonal imbalances occur.
Our adrenal glands produce the hormones epinephrine