The endocrine system is a collection of glands and organs that secrete hormones. This system is grouped according to the function that the individual organs have. Some of these organs have two roles and are called mixed organs. They secrete hormones and also perform other functions such as digestion or secretion. The pancreas is a good example of this. It secretes hormones (an endocrine function) that regulate blood sugar levels and also secretes enzymes (exocrine secretions) that break down material in the digestive tract. Hormones are released from endocrine glands and typically travel through the body in blood vessels and reach target areas that have cells receptive to the hormones. Locate and label the pineal gland, pituitary gland, thyroid gland, pancreas, adrenal glands, testes, and ovaries. Color the organs in with different colors for each organ.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.