thats not the only reason but there are hormones also which slow down heart rate and there are many more factors...
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Sachi answered this
there are different reasons why the heart beats slowly-
-resting our body, especially when we are lying down
-malfunctioning of SA node
- hormonal changes, a typical example is "adrenal rush"
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Snehal Patil answered this
When we are in rest position heart beats go slowly because body don't move
