These slides are for class use only. Do NOT duplicate or distribute. The Endocrine System Lecture Objectives and Questions 1. Define homeostasis. Communication within the body is essential to maintain homeostasis – what two organ systems are responsible for communication within the body? How do these two systems differ in their means of communication (ex. mediator molecule)? 2. Define and compare – exocrine gland versus endocrine gland. 3. List the exclusive endocrine glands within the body. What other organs and tissues also contain hormone-secreting cells that are not exclusively classified as endocrine glands? 4. Describe the role of the hypothalamus and pituitary gland in the endocrine system. The hypothalamus is part of what two organ systems? 5. Describe the role of the hormone secreting cells within the pancreas in maintaining normal blood glucose levels. Where are these hormone secreting cells in the pancreas found? Homeostasis Homeostasis is the dynamic state of equilibrium or balance of the internal environment of the body. Communication within Body Communication within the body is essential for homeostasis and is accomplished chiefly by the: 1) Nervous System – neurons communicate by sending nerve impulses along axons; at the end of axons (i.e. the axon terminals), neurotransmitters (mediator molecules) are released. 2) Endocrine System – hormones (mediator molecules) are produced by endocrine glands, secreted into surrounding tissue fluid, and then transported to target cells primarily via the blood stream. Glands Glands can either be classified as exocrine or endocrine: Exocrine → secrete onto a surface; either directly or through a duct. Endocrine → secrete internally; ductless glands; utilize cardiovascular system for distribution. Exocrine Glands Endocrine Glands Endocrine System Endocrine System “Command Center for Endocrine System” “Master Gland for Endocrine System” Endocrine System Endocrine System
