Tuesday, 15 May 2012

What is Heart Beat?

Our heart is a strong muscle. It starts to beat before we are born and then keeps on beating throughout our entire life.
A healthy heart neither gets tired nor need to rest. It has important role to perform in our body. It pumps blood throughout our entire body. The average heart beats each day is 100,000 times and it pumps about 7500 liters of blood. In a 70 year lifetime, an average human heart beats more than 2.5 billion times and it never stops beating until it fails.
The source of energy for the heart is ATP (adenosine tri phosphate) which is generated by the metabolism of food that we ingest.
The generation of repeated electrical signals in two specialized regions of the heart controls the beating of the heart. The two specialized regions of the heart are the senatorial node and the arterial ventricular node. These two signals are propagated in well controlled synchronized manner. This produces the “lop-dup” sound of our heartbeat.
The node sends out more signals when we exercise and speeds up our heart rate. This helps the blood that is moving through our body to deliver oxygen more quickly to the muscles. Special chemicals are released in our body when we are scared which makes the nodes to fire our more signals. That’s why our heart pounds when we are scared!!


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