What is the process by which the body cools itself? And how does the body generate warmth?

The human body cools itself primarily through the process of sweating and evaporation. When the temperature inside your body rises, your body's thermoregulation system kicks in to dissipate the excess heat and maintain a stable internal temperature. The brain’s hypothalamus detects the increase in temperature and signals the sweat glands to produce sweat, which is mostly made up of water with some salts and proteins. When the sweat is excreted onto the surface of the skin and then evaporates into the air, it removes heat from the body, thereby cooling it down.

On the other hand, the body generates warmth through several processes:

1. Metabolism: The most continuous source of heat is the metabolic reactions that occur throughout the body, such as those involved in digesting food and converting it into energy.

2. Muscle Activity: Shivering is an involuntary muscle activity which generates heat through rapid contractions of the muscles.

3. Hormonal Thermogenesis: The release of certain hormones, like thyroxine and adrenaline, can increase metabolic rate and thus generate heat.

4. Vasoconstriction: In response to cold, blood vessels near the surface of the skin constrict, reducing blood flow and minimizing heat loss.

By balancing these processes of heat production and heat loss, the body maintains a stable internal temperature, which is essential for optimal function of the biological systems.