Bio_1A_Lecture_21_Hormones

Bio_1A_Lecture_21_Hormones - C O M M U N IC A T IO N a n d...

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COMMUNICATION and INTEGRATION within the ORGANISM Chemical communication - the Endocrine System
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(a) gap junctions direct cellular communication (b) autocrine & paracrine signals (c) endocrine (hormone) (d) neurocrine (neurotransmitter) (e) neurohormone Means of cellular communication example: cardiac muscle cells examples: interleukins (cytokines); local factors like NO (nitric oxide) examples: secretions from most endocrine glands examples: hypothalamic hormones examples: typical nerve-nerve or nerve-muscle connectioin
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How do we get such a variety of responses?? Second , for example, Different intracellular proteins different cell responses Third , for example, Different receptors different cell responses Epinephrine α receptor Epinephrine β receptor Epinephrine β receptor Vessel constricts Vessel dilates Intestinal blood vessel Skeletal muscle blood vessel Liver cell Glycogen deposits Glycogen breaks down and glucose is released from cell First , we have a variety of hormones
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3 STEROID HORMONES -- membrane permeable There are 3 kinds of hormones e.g., CATECHOLAMINE HORMONES (& neurotransmitters) 1 AMINO ACID derivatives Nor-adrenaline Adrenaline 2 PEPTIDE HORMONES -- many; water soluble & cell im permeant (amino acid polymers) Different Hormones
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STEROID HORMONES from adrenal cortex & gonads HO CHOLESTEROL
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This note was uploaded on 10/29/2009 for the course BIO biology taught by Professor Meighan during the Fall '09 term at Berkeley.

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Bio_1A_Lecture_21_Hormones - C O M M U N IC A T IO N a n d...

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