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   |Paragraph 1                                   |Paragraph 3                                  |
   |                                              |                                             |
   |The human body is made up of a number of      |Each system is made up of organs. The lungs, |
   |different systems. Each system has a separate |for example, are part of the respiratory     |
   |function, but some work together. One system  |system. The heart is an organ in the         |
   |is the skeleton, which serves to support the  |circulatory system. The liver functions as   |
   |body and protect the internal organs. The     |part of the digestive system and other       |
   |respiratory system enables us to breathe and  |systems.                                     |
   |take oxygen into the blood, which moves around|                                             |
   |the body by means of the circulatory system.  |                                             |
   |The digestive system enables us to take in    |                                             |
   |food needed for growth. Waste matter is       |Paragraph 4                                  |
   |ejected from the body by means of the urinary |                                             |
   |system.                                       |Every organ is composed of several kinds of  |
   |                                              |tissue. Epithelial tissue, which includes the|
   |                                              |skin , forms a covering over organs.         |
   |                                              |Connective tissue supports and holds together|
   |Paragraph 2                                   |parts of the body and includes bone and      |
   |                                              |cartilage. Other types of tissue include     |
   |The endocrine system consists of various      |nerve tissue and blood tissue.               |
   |glands, such as the thyroid, sex and adrenal  |                                             |
   |glands. The function of these glands is to    |                                             |
   |secrete chemicals, known as hormones, into the|                                             |
   |blood. These hormones control various         |Paragraph 5                                  |
   |processes in the body, such as growth, sexual |                                             |
   |activities and digestion. The nervous system  |All tissue consists of cells. These are so   |
   |controls the other systems and enables human  |small that they are measured in thousandths  |
   |beings to think.                              |of a millimetre and can only be seen with a  |
   |                                              |microscope. Each cell is covered with a thin |
   |                                              |membrane which surrounds a nucleus, and a    |
   |                                              |jelly-like substance, called cytoplasm. This |
   |                                              |in turn contains minute particles, each with |
   |                                              |its own special function.                    |
   |                                              |                                             |
   |                                              |                                             |
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   |BATES, Martin, DUDLEY-EVANS, Tony. Nucleus - General Science                                |
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