Final answer:
The 'Senior Officer' usually assumes the responsibilities of the House Captain in their absence. This relates to the operational protocol within a station-like setting, not to legislative bodies like the House of Representatives.
Step-by-step explanation:
In the context of the question, which appears to relate to the internal organizational structure of a firehouse or similar, the 'Senior Officer' would typically assume the duties of the House Captain in their absence. This question does not directly relate to the provided reference information about the Speaker of the House. However, like the Speaker of the House who is the presiding officer and administrative head when in session, the Senior Officer would take on leadership responsibilities in the operational setting described.