Pulse - Myakuhaku (English spelling) pulse

Japanese: 脈拍∥脈搏 - みゃくはく（英語表記）pulse

It is also simply called the pulse. It is a wave caused by the internal pressure fluctuations at the origin of the aorta due to the beating of the heart, which is transmitted along the arterial blood vessel wall. When the heart contracts, blood is pumped into the arteries, and the pressure (blood pressure) on the inner wall of the artery increases, expanding the inner diameter of the artery. When the heart stops contracting and enters the diastolic phase, the pressure decreases and the inner diameter of the artery decreases. The pulsation of the aorta in response to this pulsation of the artery is the pulse. The pulse is an expression of the state of movement of the arterial wall, and does not represent the movement of the blood flow itself.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

単に脈ともいう。心臓の拍動によって大動脈起始部に生じた内圧変動による波動が動脈血管壁を伝わったもの。心臓が収縮すると動脈に血液が拍出され，動脈内壁にかかる圧(血圧)が上昇して，動脈の内径は拡大され，心臓の収縮が終わり拡張期に入ると，逆に圧が低下して，動脈内径は縮小する。この動脈の拍動に応じた大動脈の拍動が脈拍である。脈拍はこのような動脈壁の運動状態の表れであるため，血流の運動そのものを表すものではない。

出典　株式会社平凡社世界大百科事典第２版について　情報

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