This is from the oxidation of food during respiration in body cell.
Any increase activity,muscle action which increase respiration will increase heat production.
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Muscles expand and contract as a way to produce heat for the body.
You can move your body or shiver.
Reflected
They are warmblooded (meaning they generate their own body heat).
No.Ligtning is not a heat source.Unless u think that the electric of the lightning have heat.<<Previous answer:Yes.Fire is a heat source and a light source. If you were meaning light bulbs, then yes again. The electric current flowing through the filament (excuse spellings) causes the wire to glow (creating the light) and generate heat. This is caused by the resistance in the wire. Even tiny little leds generate heat and light. I may be wrong here.... but I dont think any light source does not generate heat of some kind. Heat is light radiation in the near and far infra-red range. You can have light sources that generate very very very little infra-red light, for example flourenscent lights produce light in the visible range almost exculsively BUT yes all light sources do produce some heat as an unavoidable energy loss.>> Lightning is a heat source. It is electricity rapidly flowing through a column of ionized air. Thunder is the shock wave it generates in the atmosphere. Think of the crackling noise a static filled blanket makes. Move it in the dark and you can see the static letting go - like lightning in miniature.