Its because you have a thin frame, I have it too.
But if you find it strange, go to your doctor, there is possibility that you may have dilation of the major aorta.
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The nervous system causes the heart to beat faster when you exercise. It itself is not an organ but a system.
when we exercise our heart beat increases due to the reason that during exercise the body need more oxygen which is carried by blood so more and more blood carrying oxygen is to move to the part for which we are doing exercise and so more of the work heart have to do to pump the blood so ultimately our heart beat increases
Place a stethoscope on your chest where you can feel the heart beat and you will hear it.
A lower resting heart rate is an effect of exercise and as an athlete is more likely to exercise more regularly then their resting heart is likely to be lower.
There are certain veins leading from your heart. and stuff.