What happens when the level of carbon dioxide in the blood increases?

If there is an increase in carbon dioxide in the blood it means that the cells would increasingly take up oxygen. so then lactic acid would be produced. Also the person that has increase in carbon dioxide in blood will die. if the level of carbon dioxide in blood increases the PH decreases. when the levels of carbon dioxide increase the blood becomes more acidic.

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Where are the options?

God to do a cool down after working out.  hope this .      cheers!