Final answer:
The first pulse typically checked by an EMT on patients one year and older is the radial pulse. It is easily accessible and effectively indicates heart rate and rhythm in older children and adults.
Step-by-step explanation:
The first pulse checked by an EMT (Emergency Medical Technician) on patients one year and older is typically the radial pulse. The radial pulse is found on the thumb side of the wrist. It's used because it is easily accessible and offers a quick way to gauge the heart rate and rhythm of a patient who is one year of age or older and is presumed to have a developed circulatory system where the radial pulse can be palpated effectively. In contrast, for infants under one year of age, the brachial pulse is typically used due to their smaller size and the differences in circulation.