biology question nt sure?

Hi Abel.

Funny question. Anyhow it has a very simple solution.

Jason got cold due to his lack of insulation (short sleeve) and the cold temperature. This made his body shiver, in order to produce some heat.

When Jason began to run, the body produced energy, and this energy was released not only for motion but also as heat. When he got home he had heated himself,

Hope that explains it:)

Human Body tries to maintain its temperature close to ~37 Celsius. Jason was exposed to cold front which removed some of the body heat from the surface. In order to maintain the temperature, body started to shiver which is a way to produce heat by making body muscle work. When he ran, Jason made his other big muscles to work. When muscles work they need to burn the carbohydrate to get the required energy and heat is the by product of all these interactions. Also by running Jason increased his heart rate and thus blood flow. Blood also helps to distribute the heat generated by the body parts to all parts of the body. So once he ran actually he brought back the temperature of the body to normal and shivering stopped.