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Introduction to the body as a whole

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Rural Technology
Man is a multi-cellular organism. The smallest functional unit of the body is cell. The cells of the body are too small to be seen with the naked eye.
Groups of cells which have same physical characteristics tend to have similar functions. A large number of cells grouped together to perform same functions are called tissues.
An organ is a collection of various tissues to form a structure, to serve a specific function.
An organ system consists of various organs which coordinately perform a major function of the body.
Each system contributes to one or more vital functions of the body. However, because of specialization of cells, none of the systems can exist in isolation.

To summarize, in our body there are various systems which work in coordination to perform important functions. Each system is composed of different organs which work together for a particular system. Each organ is made up of various tissues and different tissues have number of cells, which is the smallest functional unit of the body.
Human Body – Organ system – Organs – Tissues – Cells

The important systems of the human body are:

1. Skeleton system

2. Muscular system

3. Digestive system

4. Respiratory system

5. Circulatory system

6. Excretory system

7. Endocrine system

8. Nervous system

9. Reproductive system

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Answer in one word please:

1. The smallest functional unit of the body is:

2. The collection of various tissues is known as:

3. The total number of systems in our body are:
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