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As in other mammals, human thermoregulation is an important aspect of homeostasis. In thermoregulation, body heat is generated mostly in the deep organs, especially the liver, brain, and heart, and in contraction of skeletal muscles. [1] Humans have been able to adapt to a great diversity of climates, including hot humid and hot arid.
Humans adapted to heat early on. In Africa, the climate selected for traits that helped them stay cool. Also, humans had physiological mechanisms that reduced the rate of metabolism and that modified the sensitivity of sweat glands to provide an adequate amount for cooldown without the individual becoming dehydrated. [17] [20]
A 2022 study on the effect of heat on young people found that the critical wet-bulb temperature at which heat stress can no longer be compensated, T wb,crit, in young, healthy adults performing tasks at modest metabolic rates mimicking basic activities of daily life was much lower than the 35°C usually assumed, at about 30.55°C in 36–40°C ...
Heat also affects the brain. It can cause a person to have confusion, or trouble thinking, several doctors said. ... When Kenney tested young and old people in dry heat, young volunteers could ...
Heat affects health in several ways. Heat exhaustion, which can include dizziness, headaches, shaking and thirst, can affect anyone, and is not usually serious, providing the person cools down ...
How do you deal with extreme body heat? Arizona ER doctors offer insights on what extreme heat temperatures do to the human body. ER doctors weigh in on what extreme heat does to the body
Heat also affects the brain. It can cause a person to have confusion, or trouble thinking, several doctors said. “One of the first symptoms you're getting into trouble with the heat is if you get confused," said University of Washington public health and climate professor Kris Ebi.
The resting human body generates about two-thirds of its heat through metabolism in internal organs in the thorax and abdomen, as well as in the brain. The brain generates about 16% of the total heat produced by the body. [8] Heat loss is a major threat to smaller creatures, as they have a larger ratio of surface area to volume.