<P> Peristalsis is a radially symmetrical contraction and relaxation of muscles that propagates in a wave down a tube , in an anterograde direction . </P>
<P> Peristalsis is a radially symmetrical contraction and relaxation of muscles that propagates in a wave down a tube , in an anterograde direction . </P>
the process of peristalsis is best described as the
the process of peristalsis is best described as the
contraction and relaxation of muscles that propagates in a wave down a tube , in an anterograde direction
contraction and relaxation of muscles that propagates in a wave down a tube , in an anterograde direction