UT Arlington BIOL 1334 - Lecture 11 - Endocrine System (52 pages)

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Lecture 11 - Endocrine System



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Lecture 11 - Endocrine System

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Pages:
52
School:
University of Texas at Arlington
Course:
Biol 1334 - Introduction to Biology Ii
Introduction to Biology Ii Documents

Unformatted text preview:

BIOL 003 Organisms in Their Environment Lecture 11 Endocrine System Photo by Sarah Wolak The Endocrine System Chemical communication system Important in coordinating whole body functions Reproduction Growth development Metabolism Response to stress Chemical signals coordinate body functions The endocrine system consists of all hormone secreting cells works with the nervous system in regulating body activities Comparing the endocrine and nervous systems The nervous system reacts faster The responses of the endocrine system last longer Chemical signals coordinate body functions Hormones are chemical signals produced by endocrine glands usually carried in the blood and responsible for specific changes in target cells Hormones may also be released from specialized nerve cells called neurosecretory cells Endocrine System vs Nervous System Neuron Neurosecretory cell Endocrine cell Hormones affect target cells using two main signaling mechanisms Two major classes of molecules function as hormones in vertebrates The first class includes hydrophilic water soluble amino acid derived hormones proteins peptides amines The second class of hormones are steroid hormones small hydrophobic molecules made from cholesterol e g sex hormones Hormones affect target cells using two main signaling mechanisms Hormone signaling involves three key events reception signal transduction and response Hormones affect target cells using two main signaling mechanisms An amino acid derived hormone binds to plasma membrane receptors on target cells and initiates a signal transduction pathway Figure 26 2A s1 Water soluble hormone 1 Target cell Nucleus Interstitial fluid Receptor protein Plasma membrane Figure 26 2A s2 Water soluble hormone 1 Interstitial fluid Receptor protein Plasma membrane Target cell 2 Transduce to lead across Signal transduction pathway Relay molecules Nucleus Figure 26 2A s3 Interstitial fluid Water soluble hormone Receptor protein 1 Plasma membrane Target cell 2 Signal



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