| Thursday, November 8, 2018 | |
Portable Laser Engraver - Your new hobby | | | | | Did you know? In the current world that we are living people get involved in so many scientific discoveries. Microscopes are a necessity in most of the scientific researchers. Become a scientist > | | | | | | | o understand AF, it helps to understand the heart's internal electrical system. The heart's electrical system controls the rate and rhythm of the heartbeat. | | With each heartbeat, an electrical signal spreads from the top | of the heart to the bottom. As the signal travels, it causes the heart to contract and pump blood. | | Each electrical signal begins in a group of cells called | the sinus node or sinoatrial (SA) node. | The SA node is located in the right atrium. | In a healthy adult heart at rest, the | SA node sends an electrical signal to | begin a new heartbeat 60 to 100 times a minute. | (This rate may be slower in very fit athletes.) |
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