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What sarin gas does to your body

  • U.S. lawmakers see video that purportedly show victims of chemical attack in Syria
  • CNN's Dr. Sanjay Gupta: Exposure causes body's muscles 'go into overdrive'
  • Warning: Graphic video

If you want to help the refugees of Syria, visit CNN’s Impact Your World page.

CNN obtained videos shown Thursday to members of the Senate Intelligence Committee that purportedly show the aftermath of a chemical attack in Syria.

President Obama is trying to make a case for military strikes against Syria and will address the nation from the White House at 9 p.m. ET Tuesday.

HLN's Natasha Curry talks with CNN Chief Medical Correspondent Dr. Sanjay Gupta about the effects of sarin gas.

READ MORE: Worth knowing: A starter's guide to Syria


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