Signaling ✯

A signaling molecule (ligand) binds to a specific receptor on the cell surface or inside the cell.

Signaling between cells in physical contact. signaling

Long-distance signaling via the bloodstream (e.g., hormones). A signaling molecule (ligand) binds to a specific

Nearby cells are targeted (e.g., neurotransmitters). hormones). Nearby cells are targeted (e.g.