GENERAL HISTOLOGY

Detailed explanation-1: -The pancreas is both an endocrine and exocrine organ. It releases certain enzymes to aid in digestion delivered to the gut via the pancreatic duct. The endocrine pancreas also releases hormones such as insulin and glucagon, which are hormones predominantly related to glucose metabolism, into the blood stream.

Detailed explanation-2: -Endocrine glands secrete hormones directly into the bloodstream. The hormones dissolve in plasma and travel the circulatory pathways through various body tissues. So why do hormones affect only their target cells in particular tissues? Because only those target cells have receptors for that particular hormone.

Detailed explanation-3: -Though few hormones circulate dissolved in the blood-stream, most are carried in the blood, bound to plasma proteins. For example, steroid hormones which are highly hydrophobic, are transported bound to plasma proteins.

Detailed explanation-4: -Like the nervous system, the endocrine system is a regulatory system. However, instead of using electrical impulses for signaling, it produces and uses chemical signals called hormones, which travel through the bloodstream and control the actions of cells and organs.