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 insipidus, also called DI, is a rare condition that leads to frequent urination (passing a lot of clear urine) and excessive thirst. The condition may be caused by problems with your pituitary gland and/or your kidneys.