Most functions in jquery return a jquery object which contains a set of elements. html doesn't know the arguments of $() exactly, it's more that the result of $() has a set of elements which are created based on the parameter passed to $().
In your example of funcA and funcB though, you could easily have funcA return an object which has a function named funcB. This object could also contain the value passed to funcA and then a call to funcB could "know" that value as well.
http://jsfiddle.net/ScENm/
