Biology / Unit 4 Bio 0761 short lesson, about 20 seconds
Intercellular and Intracellular Signaling
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The idea
Intercellular signaling is communication between cells; intracellular signaling carries a message within one cell, from receptor to acting machinery.
In practice
A hormone traveling from a gland to a distant organ is intercellular; the cascade it triggers inside the target cell is intracellular.
Where people slip
The two levels connect, not compete — most intercellular signals end by triggering an intracellular one.
Your place on the trail
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Builds on
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