  We investigate the nuclear effects on the transverse and longitudinal
responses in the deep inelastic region due to the nuclear binding and nucleon
Fermi motion. We display the role of the transverse-longitudinal admixture due
to the transverse nucleon momentum. The mixing effect is appreciable at small
Q^2 values, and gradually disappears at large Q^2 values. The nuclear
modification is then dominated by the binding and Fermi-motion effects which
are contained in the spectral function.
