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Pushtoday
09-18-2015, 07:25 PM
https://www.peptideclinics.com.au/wp-content/uploads/2015/03/590x524xHiRes-1024x909.jpg.pagespeed.ic.tTFNu8_HLt.webp (https://www.peptideclinics.com.au/wp-content/uploads/2015/03/HiRes.jpg)Hormones are chemical messengers.
Hormones only have the ability to affect cells that display receptors that are specific to them.
Cells are able to display receptors for multiple hormones at one time.
If a cell shows more receptors for a particular hormone, the cell will be more sensitive to that hormone.
Up-Regulation is when a cell displays more receptors in response to a hormone
Down-Regulation is when a cell reduces its number of receptors for a particular hormone
A hormone can make changes to a cell directly by changing what genes are activated
A hormone can make changes indirectly to a cell by stimulating particular signaling pathways inside the cell that affect other processes.
Cells are influenced by a hormone when they express a receptor for that hormone.
Depending on the location of the protein receptor on the target cell and the chemical structure of the hormone, hormones can mediate changes directly by binding to intracellular hormone receptors and modulating gene transcription, or indirectly by binding to cell surface receptors and stimulating signaling pathways.