Any Human Heart writing again of a whole-life view: "I don't think there's anything wrong with going back over territory you've previously covered." Though avowedly not an (auto-)biographical novelist, Boyd acknowledged that personal experiences often subconsciously affect a writer's fiction. As in several of Boyd's novels there are parallels with the author's life: both Boyd and Mountstuart lived in Africa and France, studied at Oxford, worked in literary London and had a taste of New York. Boyd usually splits the creation of a novel into two phases: research and writing. The first phase of "Any Human Heart" took 30 months as he carefully
Heart ventricles relax and refill with blood is known as diastole. The atria and ventricles work in concert, so in systole when the ventricles are contracting, the atria are relaxed and collecting blood. When the ventricles are relaxed in diastole, the atria contract to pump blood to the ventricles. This coordination ensures blood is pumped efficiently to the body. At the beginning of the cardiac cycle, the ventricles are relaxing. As they do so, they are filled by blood passing through the open mitral and tricuspid valves. After the ventricles have completed most of their filling, the atria contract, forcing further