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. And that's exactly why epinephrine and norepinephrine are part of a group of molecules that are collectively known as cater colonines. Now, our epinephrine and norepinephrine are also water soluble. And what that basically means is they can easily dissolve inside our blood and they do not actually need any type of protein carrier to transport them inside the blood to their target cell.