Northeast - Described as a liberal bubble, high levels of education and taxation, gets bitterly cold, highly diverse, significant levels of income inequality, best schools and hospitals
Landmarks: Plymouth Rock, Harvard University, Statue of Liberty
Midwest - some parts wheat belt, farming, big areas undeveloped, prairie, but others very urbanized, number of great cities w high concentration of African Americans (although not nearly as large as South), melting pot of Protestantism and Calvinism and very suspicious of authority, factories, liberal leaning with a susceptibility for populism
Landmarks: Rock N' Roll Hall of Fame, Gateway Arch, Henry Ford Museum, Mount Rushmore
South - Hot, humid, lots of retired people, large populations of conservatives (with the exception of a number of large urban areas), tendency towards voter suppression tactics, welcoming and hospitable as long as you're not foreign looking, great varieties of fried food and excellent Mexican options, farming, oil, cows
Landmarks: Fort Sumter, Selma Bridge, The Alamo
West - major agriculture and livestock grazing, volatile weather/ climate (in some areas incredibly dry, with tornadoes, frequent droughts, etc; in others heaviest rainfall and snowfall in US), highly diverse and heavily influenced by elements of Asian, Latino, and Native American cultures, tech centers, varying rural and highly concentrated urban areas, Mormons, cowboy culture
Landmarks: The Golden Gate Bridge, Las Vegas Strip, The Space Needle, Old Faithful
Sinoatrial node part of the autonomic nervous system adjusts the heart rate and the arteriole diameter to regulate blood pressure through negative feedback
The SA (sinoatrial) node is generates an electrical signal that can causes the upper heart of the chambers (atria) to contract. The signal and then passes through the AV (atrioventricular) node to the lower of the heart chambers (ventricles), causing them to contract, or to pump. The SA node is considered the pacemaker of heart.
The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and also rate in a healthy heart. Hence, the SA node is also referred to as the natural pacemaker of the heart
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