Heart failure results in cardiac output which leads to a lack of blood from the lungs to be pumped throughout the body

low/decreased cardiac output

oxygenated blood

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

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the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.