We should all know that when we have a physical examination in the hospital, we always check the heart rate, which is the number of heart beats per minute. When checking the heart rate, the medical staff put their hands on the wrist of the subjects to feel the pulse. So why do people have pulse? To know why they can feel the pulse at the wrist, we must understand the blood circulation of the human body.
Why do people have pulse? Why is the pulse of the human body consistent with the beating frequency of the heart?
You must know that blood flows in blood vessels. When people are in normal activities, blood will keep flowing in blood vessels, and the power of operation comes from the heart. The blood vessels in the human body are connected with the heart. In medicine, the blood vessels that contain the blood flowing from the heart are called arteries. The blood flowing through the arteries is full of oxygen and nutrients, which are generally red. The blood vessels that hold the blood flowing to the heart are called veins. The blood in the veins contains carbon dioxide and waste, so it turns purple.
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Arteries and veins are connected by numerous small blood vessels, which we call capillaries. The heart is like a big water pump. After its relaxation and contraction, it sends blood to the arteries, from the big arteries to the small arteries, all over the body, and then through countless capillaries, into the veins and back to the heart.
But the blood vessel is soft and elastic like a rubber tube. After its contraction, the blood will be squeezed out and hit the artery, so the artery will expand correspondingly. The reason why the pulse can be felt at the wrist is that there is an artery passing through the wrist. The heart continuously sends out the blood stream by stream, and the arteries beat one by one. By pressing the artery on the wrist, people can understand the heart beating.
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