CHAPTER 13: ENDOCRINE SYSTEM ANATOMY 102 MIDTERM EXAM STUDY GUIDE – APHY 102.

CHAPTER 13: ENDOCRINE SYSTEM  What is a hormone and how does it act? o A hormone is an organic compound released into the extracellular spaces around endocrine cells and then diffuse into the bloodstream for distribution around the body.  Understand the role of negative feedback in control of hormone secretions. o Negative feedback is the main method of control of hormone secretion. It is a control mechanism in which a rising level of hormones leas to a decrease in hormone secretion.  Differentiate between paracrine, autocrine, endocrine, and exocrine glands. o Paracrine secretions affect nearby cells, o Autocrine secretions affect the cells that secrete their substances o Endocrine glands secrete internally, secretes into the body fluid o Exocrine glands secrete externally, secretes outside of its environment.  Where can the different endocrine glands be found in the body? o The different endocrine glands be found throughout the body. The hypothalamus, pituitary gland, and pineal gland are found in the brain. The thyroid and parathyroid glands are located in the neck. The thymus is between the lungs, the adrenals are located on top of the kidneys, and the pancreas is behind the stom