2.What are hormones?

3.Most hormones circulate in blood and come into contact withessentially all cells. However, a specific hormone usually affectsonly a limited number of cells called_____________________________which contain receptors for thathormone. When hormones bind to receptors, it triggers a cascade ofreactions within the cell that affects function.4.Endocrine glandssecrete hormones directly into the bloodstream while exocrineglands release secretions through ducts into cavities or bodysurfaces. Some endocrine glands have other functions beyond hormoneproduction and secretion. These organs are called mixed glands,because they have both endocrine and exocrine functions. Forexample:In addition to hormone production, the pancreas secretesdigestive enzymes into the small intestines. Consider the otherendocrine glands and list glands that would be considered mixedbased on the above criteria. __________________________

5.Richard has symptoms of excessive hormone production of theparathyroid gland. The doctor is certain there is a tumor on thegland. Yet, when surgery was performed on his neck, the surgeoncould not find the parathyroid gland at all. Where should thesurgeon look to find the tumor on the parathyroid gland?______________________________________________