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.
The bulbourethral glands (also known as the cowper's glands) are male sexual glands. They are located below the prostate and discharge a component of the seminal fluid into the urethra. During sexual intercourse each gland produces a secretion known as pre-ejaculate.aking the world better, one answer at a time. The main function of the bulbourethral or cowper's gland is to produce and release the pre-cum to rid the urethra of any acidic urine.