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The blood in the veins runs smoothly and evenly since there is light and constant pressure.

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Arteries are resistant to injury because of their elastic thick layer of wall.

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The blood plasma is composed of 90 percent fluid and the remaining 10 percent are compose of inorganic minerals as well as digested food substances.

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The white blood cells have two different varieties, these are under the two general groups; the phagocytes and the other one is the lymphocyte.

3

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23

..This maintenance of a constant internal environment is called homeostasis. Homeostasis ensures that the body cells are provided with a relatively constant environment so that they work efficiently and optimally, even though there might be changes outside the body..

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Function, structure and care of the circulatory system.

29

Endocrine glands are also known as ductless glands. They secrete hormones directly into the bloodstream. The endocrine glands I in both males and females are the same except for the testis (male) and the ovary (female). The majority of endocrine glands are controlled by the pituitary gland but some are stimulated by the nervous system or by chemical substances.

24

Variation gives rise to variety, diversity and uniqueness in organisms. Variation enables organisms to adapt and survive in the changing environment. This allows the organisms to breed and pass these adaptations to the next generation. Variation helps to prevent the complete extinction of animals and plants species.

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Blood is a liquid tissue. It has red blood cells, white bloods cells and plasma which are a fluid like water. Blood is transported around the body by the arteries and veins.