AbstractsBiology & Animal Science

Nowadays it is customary to regard all cells as miniature physical-chemical factories with specializations particular to each tissue or organ. The activity of cells may involve only the synthesis of substances for the upkeep of the cells themselves, or, in addition, the synthesis of substances to be released to the outside. In the latter case, raw materials are taken into the cell, incorporated into some new substance, and then released in this new form into the extra-cellular spaces or to the outside. The activity of such a secreting cell can be subdivided into a number of phases. Those may be performed singly or simultaneously.