Why does a heart attack radiate pain in the left shoulder and arm?
A. The heart will close off the blood supply to the arteries that supply the left arm, leading to the pain.
B. Damage to the heart muscle results in a flood of inflammatory products carried by the blood stream to the left shoulder and arm first.
C. The left shoulder and arm are the first to lose their blood supply and begin to hurt.
D. The nerves that innervate the heart go through the left shoulder and arm before going to the spinal cord.
E. Sometimes, stimulation of internal pain receptors is felt as pain from the skin.
Answer: E
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