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Bodies and cells

The amazing way your body and cells work

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Our bodies are made of 2 trillion tiny building blocks called cells. Just like toy building blocks, cells come in many shapes and sizes depending on what they need to build. Some come together to make our bones, muscles, heart, lungs, eyes, or skin. Each cell does its part to make our body work.

Nerve Cell

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Skin Cell

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I’m used in the structural framework for animal tissues, and play a critical role in wound healing.


Muscle Cells

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Every one of us starts as a single cell. Copies of this one cell are made through a process called ‘cell division’. One cell becomes two, and then two becomes four and so on.

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After five days, this one cell has produced enough cells to form a bubble-like structure, called a blastocyst. Up to this point, the cells can become many different things and are ‘stem cells’. But they begin to change, starting to ‘differentiate’ or specialise to become cells that will form the head and brain or the heart and other organs. Then over several weeks, the cells divide about 40 times and continue to specialise, and a baby is formed.

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Day 1

When an egg from the mother is fertilized by sperm from the father, the process of development begins. The fertilized egg is also called a ‘zygote’. When two eggs are fertilized, two separate babies can develop at the same time, resulting in ‘dizygotic’ (meaning two zygote) or ‘nonidentical’ twins.

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Birth defects 

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The developing embryo can be impacted by harmful genetic changes or toxic chemicals and other dangerous environmental factors, leading to birth defects, such as blindness, deafness, or physical abnormalities. 

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Stem Cell Therapy

Embryos contain cells that act like stem cells, which can be turned into every type of cell in our bodies. But did you know that scientists have discovered how to turn back the clock? They can take skin cells from a child or adult and turn them back into stem cells!

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This has created a new field of research called ‘regenerative medicine’. The goal is to use the stem cells created from a person’s own cells to cure genetic diseases that causes loss of eyesight, or brain function, for example.

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Body cells that are produced from stem cells may one day be used to replace an organ that is not working for us.  No longer will people need a bone marrow or kidney transplant from another person, they can grow their own replacement.

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This has a lot of benefits, because it is often difficult to find an organ donor, and there are also problems with ‘rejection’. This is when a person’s immune system attacks the transplanted organ, seeing it as an invader. Stem cells and regenerative medicine can one day change all this, saving many lives.

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Scientists at CMRI and elsewhere have learned how that one starting cell becomes all the different cells in a foetus, how a ‘stem cell’ or starter cell can change into a brain cell or a heart cell. These are called ‘cell fate’ studies. They can predict what a cell will become and even change that fate.

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Have you been paying attention

Explore more on bodies and cells and have some fun



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