Building units of the body
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The human body is made up of many parts like bones, blood, heart, stomach, lungs, and brain. These parts are made up of cells, which are the basic building blocks of life that perform all activities needed to sustain life. Cells group together to form tissues that work together to perform specific functions. Living things can either be unicellular, consisting of a single cell like an amoeba, or multicellular, made up of billions of cells like humans, animals and plants. Cells are microscopic in size and each type of cell has a different shape, size and specialized function in the body. Different cells have varying lifespans, from taste bud cells living 7 days to nerve cells living up to 130
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Building units of the body
- 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 Cells 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.
- 6. 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!