Why Pranayam + Meditation are necessary from the Medical Science’s point of view ?

From the time of the birth till death the heart works continuously. Everyday the heart pumps 7000 litres of blood, of which 70% blood is pumped to the brain and the remaining 30%  to the rest of body. How does the heart work so much efficiently and effectively ? Heart works effectively because it follows a discipline. In normal conditions the heart takes 0.3 secs to contract (systole) and 0.5 secs to relax (diastole). So 0.3+0.5=0.8 secs are required by the heart to complete one beat (1 cardiac cycle).That means…

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