Building units of the body

EDITOR: ALEEZA SHAHZAD
CLASS: 5

1. Building units of the body

2. What is our body made up of ? The human body is made up of many different parts, for example, bones, blood, a heart, a stomach, a pair of lungs, a brain, etc. What are all these parts of the body made of? Think of the way bricks are used to build a house. Cells build living things in a similar way. Cells are the building blocks of life. They make up living things and perform all the activities needed to keep living things alive. Groups of cells that are alike and work together one specific function are called tissues.

3. UNICELLULAR AND MULTICELLULAR ORGANISMS Some living things are made up of only one cell and are called unicellular. Human beings, other animals, and plants are made of billions of cells and are called multicellular. The amoeba is the unicellular organism that lives in water and wet soil.

4. The building blocks of life C ells are so small that they can only be seen with the help of a microscope. Your body contains cells of different kinds and of different sizes and shapes. Each kind of cell has a different function or job to do.

5. How long does a cell live? Every cell has a different life span. Taste bud cells live for About seven days. Red blood cells live for about four months. Nerve cells live for 18 to 130 years!