The APA style allows for in-text citations, direct quotations, and endnotes and footnotes. It is also enables the author to use the past tense of verbs in the reportage. Standards of the APA style include: 1  Bibliographic list of references. 2  Alphabetical order by author in the bibliographic list, then chronological by work.
Function [edit]. The pericardial fluid reduces friction within the pericardium by lubricating the epicardial surface allowing the membranes to glide over each other with each heart beat.
The pericardium is a thin tissue sac that surrounds the heart and consists of: Visceral pericardium -- an inner layer that envelopes the entire heart; A middle fluid layer to prevent friction between the visceral pericardium and parietal pericardium; Parietal pericardium -- an outer layer made of fibrous tissue; What Causes Pericarditis?