15 Examples of Homeostasis

The homeostasis It is the ability of living beings to maintain the internal stability of their bodies, in relation to the temperature and the pH (balance between acidity and alkalinity), by exchanging matter and energy with the environment. For example: hibernation, sweating, vasodilation.

This occurs thanks to various systems of metabolic self-regulation that sustain the dynamic balance necessary for the preservation of life.

Thus, faced with the appearance of changes in the conditions of their environment, living beings They can respond using one of the following strategies:

The homeostatic processesHowever, they do not operate entirely within these categories, as no body can be an absolute regulator or conformist. Most commonly, a mixture of the three strategies will occur, depending on the varying environmental factor and the nature of the creature.

The regulation of internal chemical balance through excretion mechanisms, or the maintenance of glucose levels by means of excretion, can also be understood as a form of homeostasis.

hormonal secretion and glycogenesis or glycogenolysis (in cases of abundance or scarcity, respectively).

Examples of homeostasis

1. Expose to the sun. It is common to see reptiles, animals unable to autonomously regulate their internal temperature (cold-blooded animals), expose themselves to the sun to increase their body temperature and energize their metabolisms.
2. Hibernation. Bears and others mammals They tend to shy away from the harshness of winter (snowfall, rain, low temperatures, little food) entering caves or burrows away from the impact of the elements. There they slow down their metabolisms and subsist with a minimum of energy consumption, sustained by the lipid reserves built previously.
3. Shiver. Faced with a sudden drop in environmental temperature, the body of other homeothermic animals gives a nerve signal to your muscles to generate a tremor that generates muscle heat and allows you to counteract the cold.
4. Glucose regulation. As we said before, in the face of the decrease or overabundance of sugars In the blood, the human body activates a hormonal apparatus designed to accelerate the synthesis of glucose (and the formation of reserve lipids) or to extract it from said lipids or, if necessary, of the muscle fibers and other tissues, in order to maintain the levels within the appropriate. The organ In charge of these tasks is the pancreas.
5. Shun the sun. In conditions of extreme sun exposure, such as deserts or in seasons of extreme temperature, reptiles and cold blooded animals They seek refuge under fallen leaves, rocks or even underground, chasing the freshness of these environments to calm the excess heat in their bodies.
6. Vasodilation. When we enter very hot environments, our body orders the widening of the blood capillaries, increasing the surface of the same exposed to the environment, and thus allowing the loss of excess heat and cooling the blood.
7. Vasoconstriction. The opposite of vasodilation occurs in low-temperature environments, in which the capillaries are close to minimize the amount of blood exposed to cold and thus conserve blood heat as much possible.
8. Skin prickling. The so-called “goose bumps” is another homeostatic mechanism, as it allows the skin hairs to stand on end and attenuates the amount of heat radiated by the skin. It is an evolutionary reflection that has remained despite the loss of some type of fur that covered our biological ancestors.

1. Sweating. It consists of the secretion of liquid substances on the skin, whose evaporation refreshes it and allows to alleviate the increase in internal temperature.
2. Control of ammonia. Although ammonia is a substance linked to our digestive processes, it provides the necessary nitrogen for various amino acids Y protein, its levels in the human body must be monitored by the liver. This organ is able to convert excess ammonia into urea and expel it through the urine formed in the kidneys. Otherwise, the increase in ammonia would lead to a deterioration in the functioning of the body.
3. Tongue perspiration in dogs. The usual image of the dog with the tongue out is due to the fact that it is the shape of the species of exchanging heat with the environment, since the dog's tongue contains numerous blood supply and allows cooling when it is extracted from the body.
4. Acceleration of respiration. When mammals are in low oxygen concentration environments, or when blood oxygen levels are too low for cellular demand (when we exercise, for example), an immediate response arises that accelerates respiration to increase the portion of air breathed. At the same time, the heart beats faster and blood pressure increases, promoting a better supply of oxygenated blood to the body.
5. Cell homeostasis. In the process of regulating the internal pressure of the cells (osmotic pressure), they release or absorb surrounding content through the selectivity of their plasma membranes, until they have the appropriate concentration levels for their stability.
6. Regulation of blood pH. The ordinary metabolism of our bodies generates amounts of waste acids that violate the appropriate level of blood acidity, whose borders compatible with life are between 7.0 and 7.7, so they must be discarded as soon as possible through various biochemical surveillance and control systems.
7. The immune system. While keeping intrusive elements that could cause inconveniences to the body at bay, our immune system acts as a mechanism to preserve the homeostasis of the system, perpetuating its stability in the face of possible infections or pathologies, even when these have already managed to penetrate the Body.

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