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 occurs when the body improperly uses antidiuretic hormone, or vasopressin, which is made in the hypothalamus of the brain. Vasopressin acts on the kidneys to regulate urine concentration. When the normal production or function of vasopressin is disrupted in some way, diabetes insipidus can result.