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4.4 Cell signalling - Coggle Diagram
4.4 Cell signalling
Signalling pathway
4 stages
- A stimulus causes certain cells to secrete ligands
- Ligands are transported to target cells
- Ligand binds to receptors (type of protein) in the cell surface membrane of target cells
- Conformational shape change of receptor activates effector protein which brings about response
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Indirect signal transduction - second messenger mediates interaction between receptor and cell's response
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1 receptor molecule activating can cause many G proteins (secondary messenger) to activate, causing signal amplification
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Definitions
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Ligand
A signal molecule, binds specifically to another molecule during cell signalling
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