Rollback is a common experience for all. Each of us resists significant changes, at least for the worse, at least for the better. Our body, brain and behavior have an internal tendency to remain unchanged within fairly limited boundaries, and when changed, to roll back, and it is very good that they do it. Just think: if your body temperature increased or decreased by 10 percent, you would be in big trouble. The same applies to blood sugar levels, and any other body functions.This state of equilibrium, this resistance to change is called homeostasis. It characterizes all self-regulating systems - from bacteria to frogs, from people to families, from organizations to whole cultures - and refers to both psychological states and behavior, and physical condition.The simplest example of homeostasis is in a home heating system. The thermostat on the wall sets the room temperature; when the temperature on a winter day drops below a predetermined level, the thermostat sends an electrical signal that turns on the heater. The heater closes the circle, supplying heat to the room where the thermostat is located. When the room temperature reaches the set value, the thermostat sends an electrical signal back to the heater, turning it off, thus maintaining homeostasis. Maintaining the desired room temperature requires only one feedback loop. Maintaining the life and health of even the simplest single-celled organism requires thousands. And maintaining a person’s homeostasis requires billions of interwoven electrochemical signals pulsating in the brain, traveling through nerve fibers,passing through the bloodstream. One example: each of us has about 150 thousand tiny thermostats in the form of nerve endings that are sensitive to the loss of heat of our body, and even a little deeper in the skin of 16 thousand or so of those that tell us about the penetration of heat from the outside.An even more sensitive thermostat is located in the hypothalamus at the base of the brain, next to the branches of the main artery, which delivers blood from the heart to the head. This thermostat can detect even the smallest changes in blood temperature. When it gets cold, these thermostats signal the closure of sweat glands, pores and small blood vessels near the surface of the body. Gland activity and muscle tension make you tremble to generate more heat, and your senses send a very clear message to your brain, prompting you to keep moving, put on more clothes, snuggle closer to someone, seek shelter or make a fire.
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Say, for example, that over the past twenty years - from high school - you have been almost completely inactive. Now most of your friends are engaged in fitness, and you decided that if you can not defeat the fitness revolution, then join it. Buying tights and sneakers is fun, as are the first steps when you start running along the school track near your home. Then, about a third of the first circle, something terrible happens. Maybe you suddenly feel sick. Maybe dizzy. Perhaps there is a strange panic sensation in the chest. Perhaps you are dying. No, you are dying., , , , . , – , . ! ! , , . , . , , , . . «»; . , , - , .
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