The blood brings oxygen to the body cells<span> and takes away their carbon dioxide. The blood that travels </span>back<span> to the </span>heart<span> and </span>lungs<span> is </span>dark red<span>. It has picked up carbon dioxide from the </span>body cells<span>, and it has left most of its oxygen with the cells.
</span><span>http://lsa.colorado.edu/essence/texts/lungs.html
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Lifestyle Changes
1. Avoid drinking coffee, soda, and other caffeinated beverages.
2.Exercise every day, but stop within a couple of hours of bedtime so you don't get too wound up to sleep.
3. Get into a regular sleep routine. Go to bed and wake up at the same time every day, if you can. ...
4. Use a heating pad.
Explanation:
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I believe the answer is A. Cleaning the operatory
Without having carbohydrates , protein , and fats our bost would slowly start to shut down .
The first one is breakfast.