Inositol is produced in your body, but you can benefit from consuming inositol in your diet. Most foods contain a small amount of inositol. A lot of research has gone into the potential benefits of myo-inositol for PCOS.
This is the print version of Human Physiology You won't see this message or any elements not part of the book's content when you print or preview this page. Homeostasis Overview The human organism consists of trillions of cells all working together for the maintenance of the entire organism.
While cells may perform very different functions, all the cells are quite similar in their metabolic requirements. Maintaining a constant internal environment with all that the cells need to survive oxygen, glucose, mineral ions, waste removal, and so forth is necessary for the well-being of individual cells and the well-being of the entire body.
The varied processes by which the body regulates its internal environment are collectively referred to as homeostasis.
Homeostasis in a general sense refers to stability or balance in a system. It is the body's attempt to maintain a constant internal environment. Maintaining a stable internal environment requires constant monitoring and adjustments as conditions change. This adjusting of physiological systems within the body is called homeostatic regulation.
Homeostatic regulation involves three parts or mechanisms: The receptor receives information that something in the environment is changing.
The control center or integration center receives and processes information from the receptor. And lastly, the effector responds to the commands of the control center by either opposing or enhancing the stimulus.
This is an ongoing process that continually works to restore and maintain homeostasis. For example, in regulating body temperature there are temperature receptors in the skin, which communicate information to the brain, which is the control center, and the effector is our blood vessels and sweat glands in our skin.
Because the internal and external environments of the body are constantly changing and adjustments must be made continuously to stay at or near the set point, homeostasis can be thought of as a synthetic equilibrium.
Since homeostasis is an attempt to maintain the internal conditions of an environment by limiting fluctuations, it must involve a series of negative feedback loops. Positive and Negative Feedback When a change of variable occurs, there are two main types of feedback to which the system reacts: Since this tends to keep things constant, it allows the maintenance of homeostasis.
For instance, when the concentration of carbon dioxide in the human body increases, the lungs are signaled to increase their activity and expel more carbon dioxide.
Thermoregulation is another example of negative feedback. When body temperature rises, receptors in the skin and the hypothalamus sense a change, triggering a command from the brain. This command, in turn, effects the correct response, in this case a decrease in body temperature. Home Heating System Vs.
Negative Feedback When you are at home, you set your thermostat to a desired temperature. Let's say today you set it at 70 degrees. The thermometer in the thermostat waits to sense a temperature change either too high above or too far below the 70 degree set point.
When this change happens the thermometer will send a message to to the "Control Center", or thermostat,which in turn will then send a message to the furnace to either shut off if the temperature is too high or kick back on if the temperature is too low. This has a destabilizing effect, so does not result in homeostasis.The complicated reasons behind an abortion at a Catholic hospital but seldom study in depth Section VII, Of Sanctions in the Church.
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