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.
Adrenal Gland Tumor Facts. The adrenal glands are part of the endocrine system, which releases hormones into the blood system. Hormones are important in many body processes, including metabolism, sexual development and puberty, and stress. There are two adrenal glands, one on the top of each kidney.