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.
Diabetes mellitus A condition where the pancreas does not produce enough insulin to use carbohydrates. Endocrine An internal gland secretion directly into the blood stream. Exocrine The external secretion of a gland through a duct into the intestine.