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What is the negative and positive feedback in homeostasis?

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Quick Answer

Negative and positive feedback are the factors in a process that drive the system either toward or away from a stable configuration, according to Dictionary.com. One example of a homeostatic process involving negative and positive feedback is the Earth's climate. Homeostasis is the tendency of the system to push back toward a stable state in response to external influences.

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What is the negative and positive feedback in homeostasis?
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Full Answer

Positive and negative feedback are central to an understanding of homeostasis, which About.com describes as one of the unifying principles in the study of biology. Examples include the regulation of the body's temperature, blood pressure and the body's water and electrolyte balance.

Howstuffworks.com describes a mechanical negative-feedback mechanism that was built into early steam engines. The fly-ball governor was a freely rotating set of swing arms with weights attached to their tips and mounted on a threaded post. As steam pressure built up inside the boiler, steam would be forced up the post and cause the arms to swing. As they swung faster, the weighted tips would rise and force open a valve to release steam. This lowered the pressure and brought down the governor's arms, closing the valve again. This is a classic example of negative feedback maintaining a constant pressure. Reversing the effects by closing the valve when the arms rise would be an example of positive feedback in which high pressure induces higher pressure still until the system breaks down.

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    How does the urinary system maintain homeostasis?

    A:

    The urinary system sustains homeostasis by eliminating wastes from the body, regulating blood acidity levels and controlling the levels of metabolites and electrolytes in the blood, such as sodium, potassium and calcium. The urinary system also maintains a stable internal environment by assisting the osmoregulation of blood volume and pressure.

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    How does the respiratory system help maintain homeostasis?

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    The respiratory system helps maintain homeostasis by regulating the intake of air into the body and by removing carbon dioxide from the blood, which in turn assists the circulatory system's function and many other operations in the body. Homeostasis is the overall equilibrium of the body's internal organs and functions. Without these internal systems being properly balanced it can lead to a number of issues in the human body, including death, depending on the severity of the imbalance.

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    How does the endocrine system help maintain homeostasis?

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    The endocrine system creates and releases hormones that transport to various parts of the body to control the body's reactions to things like stress, pain, growth and nutrient intake. These hormones can be thought of as messengers that give directions to different parts of the body, allowing the body to react to changes and maintain homeostasis.

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    What is the function of the respiratory system?

    A:

    The primary function of the respiratory system is to provide oxygen to every part of the body through the process of inhaling oxygen and exhaling carbon dioxide. The respiratory system consists of tissues and organs inside the body that allow people to breathe. This system includes blood vessels, the lungs, airways and certain muscles. The major airways of the respiratory system include the nose, windpipe, mouth, bronchial tubes and larynx.

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