You are preparing to perform an EKG recording on a patient. Which of the following information is true of limb leads and electrodes?
1) Limb leads are used to measure the electrical activity of the heart.
2) Electrodes are placed on the limbs to record the electrical signals.
3) Limb leads provide information about the different regions of the heart.
4) Electrodes are attached to the chest to capture the electrical impulses.
