The endocrine glands are the ductless organs located within organ systems and contain groups of endocrine cells that secrete their hormones directly into their surroundings. Hormones are signaling molecules that help to regulate physiology and behavior. The concentration level of a circulating hormone is directly proportional to a hormone that is released from an endocrine gland. An increase in the release of a hormone from the endocrine gland increases the concentration of hormone within the blood, whereas a decrease in the release of hormone from the endocrine gland also decreases the concentration of the hormone within the blood.

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Chapter 17.4, Problem 2WDT

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Concept introduction: The endocrine glands are the ductless organs located within organ systems and contain groups of endocrine cells that secrete their hormones directly into their surroundings. Hormones are signaling molecules that help to regulate physiology and behavior. The concentration level of a circulating hormone is directly proportional to a hormone that is released from an endocrine gland. An increase in the release of a hormone from the endocrine gland increases the concentration of hormone within the blood, whereas a decrease in the release of hormone from the endocrine gland also decreases the concentration of the hormone within the blood.

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