Answer:
Breathing rate increases to provide the body (exercising muscles) with oxygen at a higher rate. Heart rate increases to deliver the oxygen (and glucose) to the respiring muscles more efficiently. The heart, lungs and circulatory system working together make up the cardiovascular system
Explanation:
This magical number is really close to the information available on the Internet: the average adult's respiration rate to heart rate ratio is approximately 1:4, which means that for each breath, the heart beats 4 times.
