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 double-layered membrane surrounding the heart is called the  pericardium. The pericardium is a thick,  membranous sac that secretes a lubricating liquid.There is a thin â¦  inner layer that sits directly on and is attached to the surface of  the heart, called the epicardium.aking the world better, one answer at a time. The membrane surrounding the heart is called the pericardium. It is a double-walled sac that protects the heart and helps hold it in place.