http://wiki.answers.com/q275858.htmlin nematodes is because of the contraction and relaxation of the Answers.comof nematodes. A nematode is able to extend in a longitudinal direction but the circumference does not expand much. As a result of this longitudinal motion liquid gut contents visco-elastic organs react. The longitudinal somatic http://wiki.answers.com/q9209112.htmlshorten and as a result other organs expand. Answers.com of contraction and relaxation in the muscles of nematode take place and a propulsion is produced. This repeated propulsion cause motion in a nematode.
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