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From small baby to the old age, we will be grown. We are composed of bunch of atoms, multitude of atoms.

When you are grown from baby to the teen age, everyone will say "he has grown!" What do you think, did atoms got added to us? Were atoms created?

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closed as off-topic by WYSIWYG, Chris, MattDMo, Armatus, Memming May 1 '14 at 18:35

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – WYSIWYG, Chris, MattDMo, Armatus, Memming
If this question can be reworded to fit the rules in the help center, please edit the question.

atoms are not created. they are acquired in the form of different molecules.. I would suggest that you read about atoms and molecules. Further read some basics of biochemistry such as metabolism. You can find all these topics in wikipedia- the articles are nicely written and easy to understand. –  WYSIWYG Apr 29 '14 at 5:52
As of now this question would be considered off topic. It is too trivial and a simple google search would solve your problem. –  WYSIWYG Apr 29 '14 at 5:57
I don't think the OP, given its understanding of the basic laws of physics and chemistry can easily find this answer with a simple google search. I wouldn't downvote or close this question. If you typewrite "are atoms created in our body" on google you mostly find answers to the question "Do atoms of our body comes from the stars" that might not help the OP to answer his own question. –  Remi.b Apr 29 '14 at 6:16
when i search "are atoms created in our body", i get this link with a decent answer –  WYSIWYG Apr 29 '14 at 7:46

2 Answers 2

up vote 7 down vote accepted

The chemist, Antoine Lavoisier said:

Rien ne se perd, rien ne se crée, tout se transforme

, which is usually translated in english into...

Nothing is lost, nothing is created, everything is transformed.

I don't think it is still valid with modern physics but for the purpose of this question it will hold perfectly.

You are totally correct that there are more atoms in a grownup than in a kid. So where do these atoms come from? The answer is: From the food you eat. You may have known people saying that it is important to drink milk to have calcium, better to use some oils than others because they offer more unsaturated acids, important to eat that or that because an part of what we eat is incorporated in our body. In other words, food is a source of matter/atoms.

By the way, food also provides us with energy that we can make available to our body thanks to an oxydation that occur in our cells through the biochemical pathway that is called the citric acid cycle. For this oxidation to occur, we need oxygen and that's why we breath. The oxygen we inhale get in our blood and goes to each cell so that the cell can make available the energy contained in the food we eat. The citric acid cycle reject a waste which is carbon dioxide ($\text{CO}_2$). This carbon dioxide is execrated out of the body through the lungs.

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Basic conservation of mass. You eat food. That's where your mass comes from. Plants pick up CO₂ and H₂O from the air, that's where they get their mass. Those atoms get passed around the food chain, until they get released again in the form of CO₂ and H₂O. That's it in a nutshell.

If you think that human biology is magic, and magically makes atoms out of nothing, you need a LOT of remedial science education.

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