Pulse
noun, の adjective
Your veins carry the steady beats of life. That rhythmic beat is your pulse. It's always there, pulsing away… hopefully.
脈拍 is a technical word that refers specifically to your pulse rate. It's what you feel when checking your pulse on your wrist or neck.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
すでに脈拍が止まっている。
The pulse has already stopped.