Passive smoking is when someone breathes in the combination of: Smoke exhaled by a smoker + Smoke from the end of a burning cigarette or cigar. This smoke is also referred to as second-hand smoke or environmental tobacco smoke. The Effects of Passive Smoking. The scientific evidence about passive smoking shows us just how dangerous second-hand smoke really is. Here are the facts about passive smoking: Non-smokers exposed to second-hand smoke have an increased risk of lung cancer; Non-smokers who live with a smoker are 20-30% more likely to develop lung cancer
The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. Hormones are chemicals that control body functions, such as metabolism, growth, and sexual development.
Homeostasis. It is important that the bodyâs internal environment is controlled. For example, the amount of carbon dioxide in the bloodstream is carefully controlled. Maintaining a constant internal environment is called homeostasis. The nervous system and hormones are responsible for this. Here are some of the other internal conditions that are controlled: Blood sugar level. This is controlled to provide cells with a constant supply of energy. The blood sugar level is controlled by the release and storage of glucose, which is in turn controlled by a hormone called insulin. Body temperature. This is controlled to maintain the temperature at which enzymes work best, which is 37Â°C. 1  Body temperature is controlled by: 2  controlling blood flow to the skin. 3  sweating. 4  shivering.