In Article I of the Constitution, the Framers vest the legislative authority of the United States government in a bicameral Congress, and over the ten sections of the Article they systematically flesh out the structure, duties, and powers of that Congress. In the early sections of Article I they describe the membership of each House, giving life to the “Great Compromise” of the Constitutional Convention under which each state has equal representation in the Senate but population-based representation in the House of Representatives. In Section 5, they grant Congress the power to govern itself.
Section 5 consists of four separate clauses, each of which addresses different practical aspects of legislative procedure.
Martin B. Gold & Ronald Weich, Interpretation: Article I, Section 5, Interactive Constitution (2016), http://constitutioncenter.org/interactive-constitution/interpretations/article-i-section-5-by-martin-gold-and-ronald-weich.