When the skin or tissue where warm receptors are located experiences an increase in temperature, the receptor proteins in the nerve endings are activated. This activation leads to the opening of ion channels, resulting in an influx of ions such as calcium and sodium. This ionic movement generates an action potential that travels along the nerve fibers to the spinal cord and then to the brain. The brain interprets these signals as warmth, allowing the organism to take appropriate actions, such as seeking a cooler environment or initiating sweating to dissipate heat.
