Why do people who have a heart attack often experience pain radiating along the left shoulder and arm?
A. Nociceptors from the cardiac and shoulder regions all send afferent signals through the vagus nerve.
B. Nociceptors from the cardiac and shoulder regions all send afferent signals through the phrenic nerve.
C. Lack of blood to the left shoulder and arm result in ischemia and stimulates nociceptors in those regions.
D. Signals from the cardiac and shoulder region converge and follow the same pathway to the cortex.
E. Signals from nociceptors in the heart diverge and stimulate pain sensations in a large region.
Answer: D
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