Receptor: 1. In cell biology, a structure on the surface of a cell (or inside a cell) that selectively receives and binds a specific substance. There are many receptors.
The most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).he most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).
APN, abbreviation for advanced practice nurse. To assist in diagnosing and monitoring congestive heart failure (CHF) and to differentiate CHF from other causes of dyspnea. Plasma (1 mL) collected in a chilled, lavender-top tube. Specimen should be transported tightly capped and in an ice slurry. (Method: Radioimmunoassay). Atrial natriuretic peptide or atrial natriuretic factor (ANF) is a hormone secreted from cells in the right atrium of the heart when right atrial pressure increases. The release of this cardiac peptide is stimulated by increases in the stretch of the atrial wall caused by an increase in blood pressure or blood volume. ANF receptors are also stimulated by elevated sodium levels.