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First Circulatory system contains heart blood vessels and blood Its main to transport useful materials such as nutrients oxygen hormones and to remove metabolic waste such as carbon dioxide salts and nitrogenous wastes So metabolic waste is substances which are useless for the organism therefore they need to be removed For example nutrients are transported around the body through the blood in capillaries and tiny blood vessels which connected to the veins Also oxygen and wasted are transported through the capillaries as well Small amount of oxygen usually carried in the plasma out in form of gas Another function is to regulate the temperature of the body PH and water content in the cells Heat in the body should be evenly shared in the body when blood circulate around the body and so heat comes from the warm tissues which are deep inside of the body to the surface of the body which is significantly cooler than inside part of the body Regulation of the PH is important because it is used to create acidity and one of the reason and importance of PH is to keep chemical reaction at it optimal power Normal PH of the body is 7 4 and at this level body can run very efficient Temperature PH water content and blood pressure should be maintained at it optimal level to maintain homeostasis First we may find a lot of hairs on our skin and this is important because hairs have a function to trap warm air from the surroundings When hairs on the skin are straight heat loss reduced and when hairs are lying flat on the skin heat loss is increased
