Multi Threaded Support for Functional Testing as well as Performance Testing

I have 10 test cases cloned from a single test case. I execute all of them in parallel. My question is are each of the test cases running on their own unique thread or are they being multiplexed in the software, this giving the impression that each test case runs on its own thread?

I have essentially the same question for the Load Test VU's setting. IS each VU running in its own unique thread.

Having said that, the response times being reported back, appear to be the same.