Why CARDIAC MUSCLES can't take rest Share with your friends Share 2 Bhavleen answered this THEY CANT TAKE REST BECAUSE OUR HEART IS A CARDIAC MUSCLE AND IF IT TAKES REST THEN IT WONT PURIFY THE BLOOD AND MANY FUNCTIONS IN OUR BODY WONT TAKE PLACE AND WE MAY DIE. 4 View Full Answer Sharanya answered this if it stops working we will die because our heart is a cardiac muscleand if that stop we...are...DIED. 1 Haytham Reeza answered this thats why old age people die of cardiac attack 1