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Are bacteria considered as cells?

Yes, it is considered as cells. Bacteria are organisms made up of just one cell. They are capable of multiplying by themselves, as they have the power to divide. Their shapes vary, and doctors use these characteristics to separate them into groups.

Are viruses considered as cells?

No; it is DNA in a protein shell.
Viruses are too small to be seen by the naked eye. They can't multiply on their own, so they have to invade a 'host' cell and take over its machinery in order to be able to make more virus particles.
Viruses consist of genetic materials (DNA or RNA) surrounded by a protective coat of protein. They are capable of latching onto cells and getting inside them.

Sources: http://answers.yahoo.com/question/index?qid=20080824144503AAiw3px
en.wikipedia.org/wiki/Bacteria
http://www.netdoctor.co.uk/health_advice/facts/virusbacteria.htm

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What are the 12 systems of the human body?

1.Muscular system

2.Skeletal system -structural support and protection through bones

3.Reproductive system

4.Nervous system -collecting, transferring and processing information with brain and nerves

5.Digestive system -processing food with mouth, esophagus, stomach and intestines

6.Respiratory system

7.Circulatory /cardiovascular system - the blood circulation with heart, arteries and veins

8.Urinary/excretory system -eliminating wastes from the body

9.Integumentary system -skin, hair and nails

10.Lymphatic system -removal of interstitial fluid from tissues. It absorbs and transports fatty acids and fats as chyle to the circulatory system. The last function of the lymphatic system is the transport of immune cells to and from the lymph nodes.

11.Endocrine system -communicating within the body using hormones

12.Immune system -defending against disease-causing agents

Source: http://en.wikipedia.org/wiki/List_of_human_anatomical_features

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