Answer:
Explanation:
The heart is mainly responsible for cell nourishment and respiration, since the heart is also connected to the lungs through the pulmonary artery and vein. A lung doctor is vital to maintain the breathing phase of the patient, especially when blood supply to the lungs is irregular due to the heartbeat.
Answer:
Cardiovascular system and respiratory system both work together to circulate blood and oxygen throughout the body so if the heart isn't pumping fast enough the blood doesn't circulate and the body isn't getting enough blood which means it's not getting enough oxygen.