  Since the detection of non-radial solar-like oscillation modes in red giants
with the CoRoT satellite, the interest in the asteroseismic properties of red
giants and the link with their global properties and internal structure is
increasing. Moreover, more and more precise data are being collected with the
space-based telescopes CoRoT and {\it Kepler}. Particularly relevant has been
the detection of mixed modes in a large number of G-K red giants. In this
contribution we discuss the potential of these dipole mixed modes to provide
information on core extra-mixing and transport of angular momentum.
