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Ch 6-Cell Communication

Ch 6-Cell Communication - endocrine regulation hormones...

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Ch 6 CELL COMMUNICATION To maintain homeostasis, cells must continuously receive and send information Cell signaling Chemical molecules or electrical stimuli are synthesized and released and receptors on cells receive the information. Target cells either take them up or chemical changes are produced inside the cell by signal transduction . Cells respond by opening or closing ion channels , activating or inhibiting enzymes , or altering the activity genes . Signaling molecules Diffuse through interstitial fluid between cells by paracrine regulation (prostaglandins, nitric oxide, etc) Diffuse between neurons - neurotransmitters (serotonin, etc) Diffuse from one area to a distant area by
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Unformatted text preview: endocrine regulation ( hormones ) Receptor is a protein or glycoprotein on the cell surface Has a specific shape that fits the signaling molecule Different types of cells can have different types of receptors Cells can make different receptors at different times Signal transduction can be a direct result such as a change in number or form of molecules or it can set in motion other changes due to a second messenger Signal amplification (enhancing the strength of a signal) occurs during signal transduction. Signals must be terminated to allow molecules in the system to respond to new signals....
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