Yes there are two one to prevent reflux at the the bottom where it connects to the stomach and one at the top which stops are feom going to the stomach and food from going into your lungs (Sauce ) .
According to the Wikipedia article there are 50 types/kinds but I haven't found how many we can control. One of the most important though is the urethral sphincter which controls urine exiting the body (or sperm in people that produce it).
Thanks for the sauce. If GlaDos could do that she might actually. Though of course she doesn't seem to like humans at all. Then again she never wanted p
PotatOs also.
Wasn mit der Linjen jetzt wo die Wagenknecht weg is?