Yes, you read right! Four engineers, writing for the journal Science [MAG SCI] have taken up the question of how do cats drink? And, not surprisingly, they've come up with an answer. You can read the complete report online, but there is a fee.
It is fascinating to read about the structure of a cat's tongue--really. A lap is about 3/100 of a teaspoon of liquid--it's a good thing cats are small! To see a video, click here.
To learn more about a cat's body, look for the "Eyewitness" series book, Cat by Juliet Clutton-Brock [J 599.75 CLU].