Belonging to the endocrine cells of neuroectodermal distributed APUD cells play an important przypęcherzykowe C and not fully explained role in maintaining the homeostasis of the body. Each year brings ever new discoveries showing the complexity of their structure and function. C cells have receptors for various hormones and are the source of numerous regulatory peptides of auto - , para-and endocrine . Some of them , including calcitonin and somatostatin are important practical and used in the treatment of many diseases .