Cell signalling
Why?
Cells talk using signal molecules that bind receptors and set off a chain of reactions inside the cell.
Adrenaline docks on a liver cell receptor and a relay of glowing messengers passes the signal inward until stored glucose pours out.
Press the button to send an adrenaline signal into a liver cell.
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One hormone molecule triggers a cascade where each step switches on ten more, so one signal becomes thousands of responses.
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