bio181ch18 - CHAPTER 18 Endocrine System Functions of the...

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Unformatted text preview: CHAPTER 18 Endocrine System Functions of the Endocrine System The Endocrine System Regulates long-term processes  Growth  Development  Reproduction Uses chemical messengers to relay information and instructions between cells  hormones Nervous System vs. Endocrine System Communication molecules NS ES Communication route NS ES Speed and duration of message NS ES Targets NS ES Types of Hormones Can be divided into three groups Amino acid derivatives Peptide hormones Lipid derivatives Local or circulating Paracrine Autocrine Circulate freely or bound to transport proteins Lipid soluble or Water soluble The above are not exclusive groupings; there is much overlap between the groupings Chemical/Structural Classification Types of Hormones Local hormones Paracrine Autocrine Circulating hormones Free Bound Lipid soluble hormones Intracellular receptors Water soluble hormones Plasma membrane receptors Lipid Soluble Hormones Water Soluble Hormones Target Sensitivity Down-regulation Presence of a hormone triggers decrease in number of hormone receptors When levels of particular hormone are high, cells become less sensitive Up-regulation Absence of a hormone triggers increase in number of hormone receptors When levels of particular hormone are low, cells become more sensitive Hypothalamus Hormones of Hypothalamus Two Classes of Hypothalamic Regulatory Hormones Releasing hormones (RH) ...
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bio181ch18 - CHAPTER 18 Endocrine System Functions of the...

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