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A control system that appears to be self-regulating. Closed-loop systems employ feedback and a reference of correctness (norm or set point). Deviations from the norm are detected and corrections made in order to maintain a desired state in the system. Closed loop systems provide the homeostatic mechanism of many physiological functions (see negative-feedback) and also control some movement patterns, where feedback from proprioceptors and other receptors play an important part. Compare open-loop-system.
The feedback loop is pretty much a way of collecting customers complaints. They have many options on how to send complaints. If the complaint is sent through the web page the client has parameters in place on where the mail is placed such as spam, or inbox.
There are many endocrine systems. An endocrine system is one where a gland excretes substances internally or to a surface such as the skin. Both salivary glands and sweat glands are two such systems. It may seem picky to make this distinction but each system uses its own feedback to achieve homeostasis (equilibrium). There are several types off feedback loop such as "mechanical circuits" (sweat cooling skin to slow this process) or by nervous or hormonal systems. edit: Neither salivary glands nor sweat glands are apart of the endocrine system. Both are exocrine.
If you think of a thermostat, it doesn't keep a space at the exact temperature you set but starts when the temperature falls below a that point and turns off when the that point is reached. The same occurs in the body. You have a thermostat there as well. Your body temperature can be below 98.6 or above but your body responds by bringing the body back to the set point. You will sweat to cool and shiver to warm. This called feedback. Many other systems run on feedback.
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The difference between cells, tissues, organs, and body systems are that many cells make tissues, many tissues make organs, and many organs make body systems.
Smoke produced by cigarettes and smoking can change body systems.
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Smoke produced by cigarettes and smoking can change body systems.
There are many systems of the body that function on a constant basis to keep us alive. When we yawn the muscular and respiratory systems are used.
That is the organismal level. Many organisms have several organ systems.
Negative feedback, positive feedback, and neural control.