Luckily there are three types of membranes to help her. A membrane is a material or tissue that acts as a barrier or divider between two regions. A permeable membrane allows all substances to flow freely across the membrane. A semi-permeable membrane allows some substances to cross the membrane, but not others. An impermeable membrane blocks the movement of all substances. To unlock this lesson you must be a Study.com Member.
Movement Reference Number (MRN) The MRN is a unique number that is automatically allocated by the customs office that accepts the declaration. It contains 18 digits and is composed of following elements: Last two digits of the year of formal acceptance of export movement (YY) Identifier of the Member States from which the movement originates.
Medical Record Number. A unique patient identifier, as required by HIPAA, which is provided by a healthcare provider or healthcare system. Patients do not have a universal MRN as they are provided separately by different healthcare systems. An MRN will not change throughout all of the care received within a health system - unlike an account (called a HAR in Epic) or visit number (called a CSN in Epic). Hospitals typically use MRN, in conjunction with SSN, as unique patient identifiers.