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Hot and Dry (Desert)
Heat in the human body comes from external radiation and from internal metabolism. In either case the effects on the body are similar. The human body responds to heat by increasing circulation and sweating. By bringing the blood to the periphery of the body it can easily release heat into the outside environment. This decrease in resistance causes a drop in blood pressure. Its like having your thumb on a hose to get it to spray further and then suddenly taking your thumb off. The spray quickly becomes a drizzle. The same thing happens with heat. The increased size of the blood vessels and additional areas for circulation causes a drop in blood pressure. This is part of the reason that heat can make people feel tired. In this overbearing heat it is difficult to get out and exercise or even think strait. Many black men are more prone to high blood pressure. This could be a heat adaptation allowing them to work through intense heat. In intense heat most people lose their appetites. This is because your body wants to the reduce caused by metabolism to prevent overheating. Heat generally manifests with red eyes, thirst, and dark urine. It is associated with skin rashes, lesions, and irritability. One of the key signs of systemic heat is inflammation.
In the desert, heat can be deadly. The way to make yourself comfortable is to consume substances that help your internal environment stay cool. I once met a Bedouin man from Egypt. He described how his people could survive with little water: Continue reading