co-ordination
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how do multicellular organisms signal between cells (achieve coordination)?
Multicellular organisms signal between cells using extracellular signalling molecules (and complementary receptor molecules)
examples of extracellular signalling molecules
• steroid hormones • peptide hormones • neurotransmitters are examples of extracellular signalling molecules.
receptor molecules of target cells are _______ with a ________ ______ for a ________ ____________.
Receptor molecules of target cells are proteins with a - binding site for a specific signal molecule
Binding changes what on the receptor and this leads to?
Binding changes the conformation of the receptor, which initiates a response within the cell.
different cell types produce ________ ________ that can only be _______ and _______ to by cells with the _______ __________.
Different cell types produce specific signals that can only be detected and responded to by cells with the specific receptor
signalling molecules ___ have _____ ______ on ______ ____ ______ due to differences in the __________ __________ __________ and __________ that are involved.
Signalling molecules may have different effects on different target cell types due to differences in the intracellular signalling molecules and pathways that are involved.
in a multicellular organism, different ____ _______ may show a _______ - _________ response to the same ______.
In a multicellular organism, different cell types may show a tissue-specific response to the same signal