For example, a 5 panel drug test checks for 5 drugs, while a 10 panel drug screen checks for 10 drugs. A standard 5 panel drug urine test is the drug test most frequently used by government agencies and private employers.
While a member of the senate is called a senator, a representative is simply called a congressman or a congresswoman. However, collectively, both senators and representatives are also referred to as congressmen. The word Senate comes from the Latin word senate meaning old man.
Congress is bicameral, or 2 housed. The Senate has 100 members (2 for every state) and the House of Representatives has 435 (based on populations of the state, but they all have at least one). Check these sites for specifics.... 2 senators per state and there is at least one congressman per state. That one depends on the population.