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Minerals and vltamins
Minerals and vltamins are not a source of energy but they are necessary in many of the steps involved in the release of energy in the cells. Thus, they help the body to make good use of food. They protect us from illness. Minerals, such as calcium, are the basic components of bones and teeth. Iron is a component of the red pigment of blood called haemoglobin. Minerals are important in transmission of nerve impulses and for muscle contraction and relaxation. Vitamins and minerals are called Protective Foods. Water is a component of all body fluids such as blood, digestive juices, ete. Water accounts for about 50 to 70% of thebody weight. It is essential for various metabolic activities. In fact, our body cannot utilise any substance, unless it is first turned into a form soluble in water. Digestion converts food into a soluble form, so that it is readily absorbed and is carried by the blood to the sites where it is needed. The waste products like urea are carried by the blood to the kidneys from wherediey are excreted. Water also plays a role in regulating the body temperature, through perspiration. The daily water requirkment of the body depends on the climate, activity and the kind of food one - takes.
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Hormonal system: Most of us are not even aware that another system works constantly, along with the nervous system and the muscles, to direct our bodily functions. The system
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Structure of Atoms Elements are pure substances. Elements are composed of a single kind of atom, as opposed to compounds which contain two or more kinds of atoms (see lesson 5).
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