Heart 8 around the two ventricles and proceeding toward the apex. This complex swirling pattern allows the heart to pump blood more effectively. There are two types of cells in cardiac muscle: muscle cells which have the ability to contract easily, and pacemaker cells of the conducting system. The muscle cells make up the bulk (99%) of cells in the atria and ventricles. These contractile cells are connected by intercalated discs which allow a rapid response to impulses of action potential from the pacemaker cells. The intercalated discs allow the cells to act as a syncytium and enable the contractions that
Any Human Heart Any Human Heart Any Human Heart: The Intimate Journals of Logan Mountstuart is a 2002 novel by William Boyd, a British writer. It is written as a lifelong series of journals kept by Mountstuart, a writer whose life (1906–1991) spanned the defining episodes of the 20th century, crossed several continents and included a convoluted sequence of relationships and literary endeavours. Boyd uses the diary form to explore how public events impinge on individual consciousness, so that Mountstuart's journal alludes almost casually to the war, the death of a prime minister or the abdication of the king. Boyd plays ironically on