As the phase changes occur, the freedom of motion of the particles increases.
Peristalsis<span> is a radically symmetrical </span><span> contraction and relaxation of muscles</span><span> that propagates in a wave</span><span> down a tube, in an anterograde direction.</span>
<span>The hormonal deficiency which causes breast atrophy in women occurs during the normal process of menopause, a developmental stage later in life during which women experience decreased levels of estrogen. This estrogen-based type of reduction is a typical and expected outcome of menopause.</span>
