The Nervous system releases dopamine and other reward chemicals in response to stimuli. Some such stimuli are addictive substances such as nicotine. When this happens the endocrine system sends bodily messages to relax. Having too much of an artificial substance provoking reward chemicals in your brain results in you not responding or producing enough on your own. Thus how addiction begins to occur. Hope this helps!
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Health related fitness is to health as skill-related fitness is to skill.
Both refer to types of fitness related components and they determine how well able a person is in performing tasks that require effort. Health-related fitness components aims to evaluate how able is person's body to perform certain activities. This includes tests for CV endurance, muscular strength, muscular endurance, flexibility, and body composition. While skill-related fitness aims to gauge a person's specific skill in specific sports-related activities. This includes tests for agility, balance, coordination, speed, and reaction time.
To summarize, food intake is influenced by metabolic activity in hypothalamic neurons and elsewhere; by hormones that signal the body's fat content to the brain; and by other homeostatic-need situations such as low blood glucose. All of these represent instances of negative feedback.
