Your muscles use energy to contract. The by-product of this energy consumption is heat.
hypothermia brings about shivering. You will notice sometimes that you will get hives. Dont worry, they are totally harmless.
during cellular respiration sugar breaks down forming heat
The heat from nuclear fission is what generates electricity. Water is heated in a nuclear reactor, which then generates steam which is used to power electrical generators.
Heat from radioactive decay
Saturn, where it generates heat as it falls downward.
frogs are ectothermics which is an animal that generates and regulates internal body heat
generates heat
during cellular respiration sugar breaks down forming heat
skin
When the wind blows past any wet surface it begins to dry it by a process called "evaporation", but evaporation requires heat for it to succeed. If your skin is the wet surface this heat will be taken from your skin, and so you will feel cold and perhaps begin to shiver. Shivering is a mainly muscular action which generates heat.
To get warm. By shivering their muscles, heat is generated
You can move your body or shiver.
Mammals will shiver or posses what is called 'brown fat' that continuously produces heat.
Shivering is the bodys way of raising the temperature. When we shiver our muscles are working, and as they work they generate heat. Heat, as in running a fever helps fight infections, as the bacteria doesn't multiply as well when it gets warmer.
The CPU
The heat from nuclear fission is what generates electricity. Water is heated in a nuclear reactor, which then generates steam which is used to power electrical generators.
Muscle contract and expand involuntarily to produce heat
wood generates heat and it has for many years. It can be burned to create heat.