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What is the meaning of the bold word as it is used in the sentence?


Because blood levels change as the heart pumps blood through the body, the amount of light bouncing back into the monitor allows it to calculate the person’s pulse rate.

To shine light in bursts

The amount someone is breathing

The rhythm of a heartbeat

The speed of one’s thoughts

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Answer 1

The rhythm of a heartbeat.

(The monitor measures changes in blood volume with each heartbeat to calculate the person’s pulse rate.)