Shannon (1956:41) discussed the debated issue whether or not the lygosome skinks of the New and Old worlds are conspecific. Some Reptiles and Amphibians from Korea Robert G Webb This demonstrated sympatry indicates that the two kinds are not conspecific.
Heart rate (or pulse) is the number of times your heart beats per minute. Normal heart rate varies from person to person and is normally 60 to 100 times a minute. The best places to find your pulse are the wrists, the inside of your elbow, the side of your neck and the top of the foot.
The animation shows how the heart's internal electrical system causes the heart to pump blood. Your heart's electrical system controls all the events that occur when your heart pumps blood. The electrical system also is called the cardiac conduction system. If you've ever seen the heart test called an EKG (electrocardiogram), you've seen a graphical picture of the heart's electrical activity.