Google - how much the normal heart beat in second ?
or:Google - how much the normal heart beat in second ?or:Depending on activity, normal heart beat is between once per second and twice per second. Bu
or:Google - how much the normal heart beat in second ?
or:Depending on activity, normal heart beat is between once per second and twice per second. But medical people count it in beats per minute: 60 to 120.
