Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'SA node cell to atrial cardiac muscle cell signaling'?

A. Any process that mediates the transfer of information from an atrial cardiomyocyte to an AV node cell.
B. Any process that mediates the transfer of information from an SA node cardiomyocyte to an atrial cardiomyocyte.
C. Any process that mediates the transfer of information from a bundle of His cardiomyocyte to a Purkinje myocyte.
D. Any process that mediates the transfer of information from an AV node cardiac muscle cell to a bundle of His cardiomyocyte.

Answer: Any process that mediates the transfer of information from an SA node cardiomyocyte to an atrial cardiomyocyte.