When a change of variable occurs, there are two main types of feedback to which the system reacts: 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. 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.īecause 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. This is an ongoing process that continually works to restore and maintain homeostasis. And lastly, the effector responds to the commands of the control center by either opposing or enhancing the stimulus. The control center or integration center receives and processes information from the receptor. The receptor receives information that something in the environment is changing. Homeostatic regulation involves three parts or mechanisms: 1) the receptor, 2) the control center and 3) the effector. This adjusting of physiological systems within the body is called homeostatic regulation. Maintaining a stable internal environment requires constant monitoring and adjustments as conditions change. It is the body's attempt to maintain a constant internal environment. Homeostasis in a general sense refers to stability or balance in a system. The varied processes by which the body regulates its internal environment are collectively referred to as homeostasis.
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.
While cells may perform very different functions, all the cells are quite similar in their metabolic requirements. The human organism consists of trillions of cells all working together for the maintenance of the entire organism. You won't see this message or any elements not part of the book's content when you print or preview this page.
This is the print version of Human Physiology
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