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Sagot :
What is an homeostasis?
Homeostasis
any self-regulating process by which biological processes seek to sustain equilibrium when adapting to optimum survival conditions If homeostasis is achieved, life continues; if it is not, catastrophe or death occurs. The achieved stability is a complex equilibrium in which constant transition happens while sufficiently uniform conditions prevail.
What is an example of homeostasis in a living thing?
- Human body temperature regulation is one of the most well-known manifestations of homeostasis. Normal body temperature is about 37 °C (98.6 °F), but a variety of causes, such as exposure to the elements, hormones, metabolic rate, and illness, may cause extremely high or low body temperatures. The hypothalamus in the brain controls body temperature, and input from the body is carried through the bloodstream to the brain, resulting in changes in breathing rate, blood sugar levels, and metabolic rate.
- Reduced movement, perspiration, and heat-exchange mechanisms that allow more blood to flow near the skin's surface, on the other hand, contribute to heat loss. Insulation, decreased airflow to the skin, clothes, shelter, and exterior heat sources all help to minimize heat loss.
What is an example of homeostasis in a mechanical system?
- The action of a thermostat, a mechanism that controls room temperature, is a well-known example of homeostatic control in a mechanical system. A bimetallic strip in the center of a thermostat responds to temperature variations. The strip stretches in hot weather and contracts in cold weather to interrupt or complete an electric circuit.
- When the room cools, the circuit is finished, the furnace begins to operate, and the temperature increases. At a predetermined temperature, such as 20 °C (68 °F), the circuit is broken, the furnace shuts down, and no additional heat is emitted into the space. The temperature gradually drops until the room cools enough to restart the operation.
Are there examples of homeostasis in ecosystems?
- The definition of homeostasis has also been used in biodiversity research. Robert MacArthur, a Canadian-born American ecologist, suggested in 1955 that homeostasis in habitats is caused by biodiversity (the variety of life in a given place) and the ecological interactions (predation, competition, decomposition, etc.) that occur between the organisms that live there.
- Often ecologists use the word homeostasis to describe the back-and-forth interaction that happens between various areas of an ecosystem to sustain the status quo. This form of homeostasis was thought to help understand why trees, grasslands, and other habitats survive (that is, remain in the same location for long periods of time). Since 1955, the term also evolved to include nonliving components of the environment, such as rocks, soil, and water.
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