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.
Heart Rate vs Pulse Rate. Heart rate and Pulse rate are often misunderstood as one and the same thing. Actually there are some differences between the two.It is true that your pulse rate starts with your heart beat. A heart beat causes a pulse in your arteries.eart Rate vs Pulse Rate. Heart rate and Pulse rate are often misunderstood as one and the same thing. Actually there are some differences between the two.