IMO, and I could be wrong, but the drive from Minn/St Paul, other than the Mall of America in Minneapolis, has nothing of interest until you get to the Badlands, Custer STate Park, Crazy HOrse, Mt Rushmore area. Deadwood SD for a day and night, I found to be of interest.
Sinoatrial node is located at the junction of the superior vena cava with the right atrium.
It means the heart beat originated from a muscle, (however, it is regulated by the nerves). The heart beat originates from the sinoatrial node (SA Node)-pace maker, which lies in the wall of the right atrium near the opening of the superior vena cava. The SA node is a mass of neuromuscular tissue. Sometimes, the SA-Node may become damaged or defective. So the heart does not function properly.