Members of Parliament typically serve until the next dissolution of Parliament, but the House of Commons does have the power to expel a Member in cases of serious misconduct or criminal activity. If a Member is expelled, their seat becomes vacant, and a by-election is held to fill the vacancy. This ensures that the integrity of Parliament is maintained and that the constituents continue to be represented. 

Key Point: The power to expel Members of Parliament is an important aspect of maintaining ethical standards within the legislative body. The process underscores the accountability of MPs to their constituents and the broader principles of democratic governance.