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 is a condition that disrupts normal life due to increased thirst and passing of large volumes or urine, even at night. It is a part of a group of hereditary or acquired polyuria (when large amounts of urine is produced) and polydipsia (excessive thirst) diseases.