A person may be resuscitated and suffer little damage if his or her heart has stopped beating and breathing has stopped for as long as 5 minutes.
What is a heartbeat?
- A heartbeat is a two-part pumping action that lasts approximately one second.
- As blood accumulates in the upper chambers (the right and left atria), the heart's natural pacemaker (the SA node) emits an electrical signal, causing the atria to contract.
- This contraction forces blood through the tricuspid and mitral valves and into the lower chambers, which are at rest (the right and left ventricles).
- Diastole refers to the first of two pumping phases (the longer of the two). When the ventricles are full of blood, the second part of the pumping phase begins.
- The heart does not work alone because the brain monitors the environment around us—temperature, stress, and level of physical activity—and adjusts our cardiovascular system to meet those needs.
To know more about heart beat, refer to:
https://brainly.com/question/11245663
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