Question

we can control our eye ,hand ,leg,head but why we can't control the heart

Answer 1

Becoze our heart is not control by brain, it works on involuntary action.
And cannot control by brain.

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Answer 2

The heart is an internal blood pumping organ which has no  somatic nervous connection ; there simply isn't any  nerve that mediates voluntary control for it. Only autonomic nerves control the heart besides its own pacemaker.