- Cells communicate to control processes inside the body and respond to changes in the environment.
- Cell signalling uses messenger molecule.
- It starts when one cell releases a messenger molecule (hormone)
- This molecule travels to another cell (in the blood)
- The messenger molecule is detected as it binds to a receptor on the cell membrane.
- The binding then triggers a change in the cell (series of chemical signals are set off)
- Receptor proteins have specific shapes - only messenger molecules with…