2Endocrine System Overview Defined: Body system that controls growth, development, environmental responsesPhysically disconnectedGlands: Major organs of the endocrine systemMake hormonesHormones: chemical signals that move through blood streamHormones attach to cell receptorCause target cells produce proteins
3Steroid & Non-Steroid Hormones Naturally produced by the bodyTravel through bloodAttach to receptor of target cellsTarget cell creates proteins
4Steroid & Nonsteroid Hormones Differences BetweenSteroid & Nonsteroid HormonesSteroid hormones enter into the cell.Non-steroid hormones do not enter the cell.Non-steroid hormoneSteroid hormoneNonsteroid hormone binds to receptor on the cell membrane.Steroid hormone diffuses through the cell membranereceptorSteroid hormone binds to a receptor within the cell.Receptor stimulates a 2nd messenger with in the cell.second messengerreceptornucleus2nd messenger starts a series of chemical reactions in cytoplasm.The hormone and receptor enter the nucleus and bind to DNAChemical reactionsDNASteroid hormone causes DNA to make proteins.2nd messenger reactions activate enzymes.proteinsactivated enzymes
51988 Summer Olympics: Ben Johnson (Canada) vs 1988 Summer Olympics: Ben Johnson (Canada) vs. Carl Lewis (USA) The Race that Shocked the World
11Communication Between Nervous System & Endocrine System coldConnected by the hypothalamus in the brainReceives signals from sensorsProduces releasing hormones that stimulate other glands to produce hormones.Ex: Used in thermoregulation to maintain homeostasishormone Ahormone Bhormone C
13Review What are glands and what do they release? What do hormones direct cells to create?How do hormones travel through the body?What gland connects the endocrine and nervous systems?What are the differences between steroid and nonsteroid hormones?Examine the diagram of the endocrine system on slide #12. Practice labeling the 8 different glands.Which gland….releases insulin to lower blood sugar levels?increases your alertness and blood pressure?helps your white blood cells mature?is located atop your kidneys?are found in your brain (two answers)?is considered your body’s thermostat?