Explain the mechanism of pulse:
When the left ventricle of the heart contracts, blood is forced from the heart into the aorta. The aorta is already filled with blood and must expand to accept the blood being pushed out of the left ventricle. This creates a pulsating wave that travels from the aorta through the walls of the arterial system. This wave, known as the pulse, can be felt as a light tap by an examiner.