WordNet sense 1 (the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health):

heart rate, pulse rate

WordNet sense 2 ((electronics) a sharp transient wave in the normal electrical state (or a series of such transients)):

impulse, pulsation, pulsing

WordNet sense 3 (the rhythmic contraction and expansion of the arteries with each beat of the heart):

beat, heartbeat

WordNet sense 4 (expand and contract rhythmically; beat rhythmically):

pulsate, throb