 
			 
			MCQOPTIONS
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				| 1. | Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it | 
| A. | mimics the action of signal receptors | 
| B. | is broken down into hormones that affect the heart | 
| C. | interferes with chemical cascades that trigger contraction of heart muscle | 
| D. | breaks down into nitric oxide, which increases blood flow to the heart | 
| Answer» E. | |