Title What is baseballâs âmodern eraâ? The start of the 20th century might not seem particularly modernâafter all, there were only 45 states in the Union, hardly anyone owned a car (the Model T didnât debut until 1908) and William McKinley, a Civil War vet, occupied the White House.
Sinus tachycardia is a normal increase in the heart rate. How it happens. The sinoatrial (SA) node --- the heart's natural pacemaker-sends out electrical signals faster than usual. The heart rate is fast, but the heart beats properly.inus tachycardia is a normal increase in the heart rate. How it happens. The sinoatrial (SA) node --- the heart's natural pacemaker-sends out electrical signals faster than usual. The heart rate is fast, but the heart beats properly.
How fast can the human heart beat is a fascinating topic full of interesting facts. The human heart generally beats 60 to 80 times a minute, though anywhere between 60 and 100 beats per minute is considered normal, according to the Heart Rhythm Society.The heart beat increases during exercise, up to 160 to 180 beats per minute. If a heartbeat is fast but also irregular, it is diagnosed as atrial fibrillation which is the most common type of heart rhythm disorder in the US, according to the Heart Rhythm Society. 2  How fast the human heart can beat depends on age. 3  The heart generally beats faster in children than adults.