To increase oxygen delivery to working muscles during exercise, heart rate increases. Barry's heart rate has increased from 60 beats per minute (bpm) at rest, to 120 bpm during a run. What happens to the time taken for each cardiac cycle

Agroup of engineering students from purdue university reported that its licking machine, modeled after a human tongue, took an average of 364 licks to get to the center of a tootsie pop. twenty of the group's volunteers assumed the licking challenge-unassisted by machinery-and averaged 252 licks each to the center.