Concept:A pulse is the rhythmic expansion or dilation of an artery as blood surges through it after each heartbeat.
Explanation:When the heart contracts, blood is forcefully ejected into the arteries.
This sudden rush of blood causes the artery walls to expand briefly.
This expansion is felt as the pulse.
It is not the contraction of arteries or veins.
It is also not the pumping action of the heart itself.
Thus, the pulse is best described as dilation of arteries to accommodate blood rushing through.
Answer:C. dilation of arteries to accommodate blood rushing through.