  We discuss the axial form factors of the nucleon within the context of the
nonrelativistic chiral quark model. Partial conservation of the axial current
(PCAC) imposed at the quark operator level enforces an axial coupling for the
constituent quarks which is smaller than unity. This leads to an axial coupling
constant of the nucleon $g_A$ in good agreement with experiment. PCAC also
requires the inclusion of axial exchange currents. Their effects on the axial
form factors are analyzed. We find only small exchange current contributions to
$g_A$, which is dominated by the one-body axial current. On the other hand,
axial exchange currents give sizeable contributions to the axial radius of the
nucleon $r_A^2$, and to the non-pole part of the induced pseudoscalar form
factor $g_P$. For the latter, the confinement exchange current is the dominant
term.
