One of the reasons, a person during initial stages of atherosclerotic coronary blood vessel may not show any symptoms of cardiac dysfunction because  1. Coronary blood vessels show marked reactive hyperemia. 2. Coronary blood vessels carry large amount oxygen which is not fully used by myocardium 3. The threshold for activation of the pain fibers associated with the Coronary blood vessels does not occur until they are fully compressed by the disease. 4. None of the above is correct

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A:

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A: Atrial fibrillation is the condition when atrial contraction more than 350beat/ minute

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Stress

Stress is defined as the feeling of being overwhelmed or unable to cope with emotional or mental pressure. Any event or action that makes a person annoyed, furious, or nervous can trigger it. Chemical changes in the body caused by stress can cause blood pressure, blood sugar levels, and heart rate to rise.