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 and Pulse rate is often same thing. The pulse starts in the heart beat. Every heart beat causes a pulse in the arteries, similar to the ripple a stone makes when itâ¦ is thrown in a pond. The heart rate is the number of times your heart contracts in one minute. The heart is a muscular pump that with each heart beat pumps blood around the body by contraction of the heart's muscle.