Final answer:
The radial artery at the wrist is the most common pulse site for measuring heart rate due to its accessibility and reliability.
Step-by-step explanation:
The most common site to take the pulse is the radial artery. This artery is located at the wrist, where it is easily accessible and provides a reliable location for measuring heart rate. The radial artery forms at the bifurcation of the brachial artery and travels down the forearm, paralleling the radius bone. It is the favored spot for checking pulse because it lies close to the surface of the skin and is supported by the bones beneath, making it relatively easy to palpate.