Peemen?

Clearly, dead week isn't working. I'm a little behind in what I had planned for studying today, but I needed to find out the anwer to this question. This question came up when 2 of my classmates and I were reviewing the male reproductive system in lab yesterday. Don't continue to read if you think learning about the male reproductive system is gross (because I know some people don't want to know this kind of stuff). Anyways, the question was: How is urine blocked when a guy ejaculates? Answer: the internal urethral sphinter (one of the valves that keeps your urine from leaking from your bladder). After discovering this I thought the answer was quite straighforward. I can't believe we couldn't figure it out yesterday. LOL! There were a lot of other weird, hilarious stuff that came up in anatomy. I'll blog about them after I'm done with summer school.