Delete Content. A plasma membrane is permeable to specific molecules that a cell needs. Transport proteins in the cell membrane allow for selective passage of specific molecules from the external environment. Each transport protein is specific to a certian molecule (indicated by matching colors).
The pancreas contains cells which release both insulin and glucagon. The endocrine system consists of a number of different glands which secrete hormones that dictate how cells and organs behave.
The Adrenal glands are located on top of the kidneys and are an integral part of the endocrine system. They are responsible for producing major hormones such as Cortisol (released in response to stress) and adrenaline (fight or flight response).