Compare positive and
negative feedback systems
Or See Examples
of Homeostatis here.
Homeostasis is a process by which a constant internal environment is maintained despite changes in the external environment.
The word is derived from the Greek words homoios, meaning “similar” or “like,” and stasis, which means “standing still.” The term is appropriate because the body maintains a constant balance, or steady state, through a series of monitored adjustments.
Negative feedback systems: Mechanisms that make adjustments to bring the body back within an acceptable range are referred to as negative feedback systems. The household thermostat is an example of such a system.Other examples include maintaining the blood glucose levels,maintaining body temperature,maintaninh blood PH etc.
Positive feedback systems:positive feedback process by which a small effect is amplified. These are less common in our body when compared to negative feedback systems. Positive feedback systems move the controlled variable even further away from a steady state. The value of a positive feedback system is that it allows a discrete physiological event to be accomplished rapidly. Once this event is accomplished, the feedback system stops.
Example: Production of oxytocin hormone during child birth.
Differentiate between positive and negative feedback systems.
|Negative Feedback||Positive Feedback|
change in the body
2. Values remai with in a range
3. Common in the body
1. Reinforce change
2. Values goes out of range
3. Very uncommon
See Examples of Homeostatis here.
Many diseases involve a disturbance of homeostasis. As the organism ages, the efficiency in its control systems becomes reduced. The inefficiencies gradually result in an unstable internal environment that increases the risk of illness, and leads to the physical changes associated with aging.
Certain homeostatic imbalances, such as high core temperature, a high concentration of salt in the blood, or low concentration of oxygen, can generate homeostatic emotions (such as warmth, thirst, or breathlessness), which motivate behavior aimed at restoring homeostasis (such as removing a sweater, drinking or slowing down).
An important part in maintaining a balance in the body is the maintenance of body fluids, dilute and watery solutions that contain dissolved chemicals found inside cells and the surroundings of them. Inside the cells it is called intracellular fluid; outside of the cells it is called extracellular fluid. All the substances such as oxygen, nutrients, proteins and ions, are needed to maintain life. The composition of interstitial fluid changes as substances move back and forth between it and the blood plasma, this occurs across the thin wall of the smallest blood vessels in the body, the blood capillaries. Carbon dioxide is removed from intestinal fluid.
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Here are all of the molecules that we do an in-depth Lewis structure analysis on: