The Nigerian Second Republic lasted from 1979 to 1983, during which time the country had a presidential system of government with a bicameral legislature known as the National Assembly. The composition of the National Assembly under the Nigerian Second Republican Constitution was as follows:

1. Senate: The Senate was the upper chamber of the National Assembly, and it consisted of 95 members. Each of the 19 states at the time had 5 senators, while the Federal Capital Territory had 1 senator. Senators were elected to a 4-year term.
2. House of Representatives: The House of Representatives was the lower chamber of the National Assembly, and it consisted of 449 members. The number of representatives allocated to each state was based on its population, with a minimum of 4 representatives per state. Representatives were elected to a 4-year term.

Overall, the National Assembly under the Nigerian Second Republic Constitution had a total of 544 members (95 senators and 449 representatives) who were elected by the citizens of Nigeria through a general election.