Homeostasis

And the digestive system

Homeostasis

Homeostasis is the property of a system in which variables are regulated so that internal conditions of your body remain stable and relatively constant. The concept was described by french psychologist Claude Bernard in 1865 and the word was made by Walter Bradford Cannon in 1926. Although the term was originally used to refer to processes within living organisms, it is frequently applied to automatic control systems such as thermostats. Homeostasis requires a sensor to detect changes in the condition to be regulated, an effector mechanism that can vary that condition, and a negative feedback connection between the two.

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System Interactions

The Skeletal System

Muscles connect to your skeleton and they contract and move the skeleton along. Your skeletal system is made up of cartilage and calcified bone that work together. They help the process of movement happen in a smoother manner. The calcified bones of your skeleton also work with the circulatory system.

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The Circulatory System

Active muscles demand huge amounts of oxygen, and the circulatory system works hard to provide it. Blood carries oxygen to the muscles. When the body is at rest, blood carries nutrients to the muscles so that they can repair and rebuild themselves. Blood also carries away the waste products that hardworking muscles produce, back out through the lungs to be filtered.

The Nervous System

Receptors in muscles provide the brain with information about body position and movement. The brain controls the contraction of skeletal muscle. The nervous system regulates the speed at which food moves through the digestive tract.

Junk food and health

According to http://healthyeating.sfgate.com/reasons-eating-junk-food-not-good-3364.html junk food is food that is calorie-dense and nutrient poor. In recent decades, junk food, fast food and convenience food consumption in the United States have increased dramatically, with 25 percent of people now consuming predominantly junk food diets. This trend has occurred concurrently with rising epidemics of numerous chronic diseases and accounts for a long list of reasons why eating junk food is bad. Junk food plays a major role in the obesity epidemic. By the year 2050, the rate of obesity in the U.S. is expected to reach 42 percent, according to researchers at Harvard University. Children who eat fast food as a regular part of their diets consume more fat, carbohydrates and processed sugar and less fiber than those who do not eat fast food regularly. Junk food may lead to depression in teenagers, according to Andrew F. Smith, author of the book "Fast Food and Junk Food: An Encyclopedia of What We Love to Eat." Hormonal changes at puberty make teens more susceptible to mood and behavioral swings. A healthy diet plays a part in keeping hormone levels on an even keel, while a diet high in junk food falls short of these requirements. There are numerous diseases caused by eating junk food. Some are heart disease, liver disease, stroke, and type 2 diabetes.

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