The circulatory system Endocrine system
2.4.1 The circulatory system
The circulatory system moves nutrients, gases, and wastes to and from cells to help fight diseases and help stabilize body temperature and pH. This system may be seen strictly as a blood distribution network, but some 26 consider the circulatory system as composed of the cardiovascular system, which distributes blood, and the lymphatic system, which distributes lymph. The main components of the human circulatory system are the heart, the blood and the blood vessels. The circulatory system includes: Pulmonary circulation: where blood is passed through the lungs and becomes oxygenated. Systemic circulation: where the oxygenated blood is passed through the rest of the body. An average adult contains 4.7 to 5.7 litres of blood, which consists of plasma, red blood cells, white blood cells and platelets. Also, the digestive system works with the circulatory system to provide the nutrients the system needs to keep the heart pumping. The lymphatic system is responsible for the removal of interstitial fluid from tissues as well as the absorption and transport of fats and fatty acids. The lymphatic system is also responsible for the transport of antigen presenting cells APCs. The cardiovascular system is exposed to any agent carried in the blood. Carbon monoxide and many metals including chromium, manganese and lead are thought to cause damage to heart muscle, but the only proven link is with cobalt. Chlorinated hydrocarbons like CFCs, trichloroethylene and 111- trichloroethane can induce arrhythmias abnormal heart rhythms due to defects in electrical conduction in the heart. Trichloroethylene has caused sudden death this way. Carbon disulphide viscose rayon industry speeds up atherosclerosis hardening of the arteries. High or low temperature work affects the peripheral circulation and can strain the heart. 272.5 The Blood
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» Basic Principles is Occupational Hygiene 2010
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