Which term identifies the originator of a message transmitted over a channel?

The term that identifies the originator of a message transmitted over a channel is "Sender." In communication theory, the sender is the individual or entity that initiates the message. This includes the responsibility for creating and encoding the information to be conveyed, which is then transmitted through a chosen medium or channel.

In the context of health informatics, the sender could be a healthcare provider sending patient information, a data system transmitting health records, or any source delivering relevant data to another party. Understanding the role of the sender is crucial for ensuring that effective communication takes place, as it reflects the need for clear, accurate, and secure transmission of information within healthcare systems.

The other terms do not define the originator: the receiver refers to those who receive and interpret the message, while the distributor and channeler are not standard terms used to identify the party creating the message.