Now, the medulla is the inner portion of our adrenal gland and it is responsible for secreting those hormones that essentially help us respond to physically and emotionally stressful and challenging situations. Now, the cells of the medulla are actually connected to the sympathetic division of the autonomic nervous system and that's because these hormones that are used by this endocrine gland are also used by the nervous system as neurotransmitters. And we'll see what that means in just a moment. So the adrenal gland is responsible for secreting two types of hormones. We have epinephrine, also known as adrenaline, and we have norepinephrine, also known as noradrenaline. Now, these two hormones are tyrosine derivatives and that means they are produced from tyrosine amino acid.