Mounds in the water form in areas where the water meets land, where water is warmer, or where two currents converge. Gravity then pushes this water down slope on the mounds and creates currents. Deep water currents, also called thermohaline circulation, are found below 400 meters and make up about 90% of the ocean. Like surface currents, gravity plays a role in the creation of deep water currents but these are mainly caused by density differences in the water.
The pacemaker of the heart is a bundle of cells that tells the  heart when to beat. These cells are connected to the rest of the  cells of the heart and communicate with theâ¦m through electrical  signals. The pacemaker cells set the pace (or rate) of the  heartbeat.    The actual structure that serves as the heart's primary pacemaker  is called the sinoatrial node (SA node).
The wires attach the generator to the heart. There are two primary types of pacemakers, namely: Standard Pacemaker which sends an electrical impulse via special wires that are attached to the heart. Pacemaker Combination, or Implantable Cardioverter-Defibrillator, as earlier discussed above. This is commonly used in lethal types of heart rhythms.