* Nerve cells. Cold temperatures can slow down the speed at which nerve cells transmit signals. This can lead to problems with coordination, balance, and reaction time.

* Muscle cells. Cold temperatures can cause muscles to become stiff and weak. This can make it difficult to move and can also lead to muscle pain.

* Blood cells. Cold temperatures can cause blood vessels to constrict, which reduces blood flow to the skin and other tissues. This can lead to frostbite and other cold-related injuries.

* Skin cells. Cold temperatures can damage skin cells, causing them to become dry, cracked, and irritated.

* Immune cells. Cold temperatures can weaken the immune system, making people more susceptible to infections.