Which of the following physiological processes is not an example of cell-to-cell signalling?
The release of nitric oxide by endothelial cells to trigger the relaxation of adjacent vascular smooth muscle cells.
The binding of antidiuretic hormone (ADH) to transmembrane receptors on the epithelial cells of the kidney collecting duct.
The movement of potassium ions (K+K^+K+) through voltage-gated membrane channels during the repolarisation of an axon.
The secretion of interferon by a virus-infected cell to induce antiviral protein synthesis in neighbouring uninfected cells.
