<s>[INST] What is the function of the heart that stops? [/INST] The heart acts as a pump to force the blood around the body and in heart failure, the heart is unable to pump the blood effectively which means that blood can’t deliver enough oxygen and nourishment to your body to allow it to work normally. This may cause you to feel tired or fatigued.  Source: NARAYANA HEALTH . Link: https://www.narayanahealth.org/blog/common-patient-questions-related-to-heart-failure/. Field: Cardiovascular. Disease: Heart Failure </s>