Jumat, 27 Agustus 2010

Introduction Platyhelminthes

CHAPTER I
INTRODUCTION

Platyhelminthes has a bilaterally symmetrical shape of body. They are known as triploblastic true multi-cellular animals with organ grade of organisation. The Body is dorso-ventrally compressed, leaflike. A body cavity is absent. Space between body wall and alimentary canal is filled with mesenchyme (connective tissue). Digestive system is incomplete. Anus is absent. Respiration by simple diffusion.
Excretion with the help of specialised cells called flame cells or solenocytes. Nervous system is ladder-like consisting of a brain and a pair of longitudinal nerves connected by many transverse nerves. Reproduction is usually by sexual methods. Majority of the forms are bisexual (hermaphrodites).
The phylum of platyhelminthes is divided into three classes, they are class turbellaria, class trematoda, and class Cestoda. The examples are Planaria, Fasciola (Liver fluke) Schistosoma (Blood fluke), Taenia, and Solium (Tape worm).
It is important for us to lear more about the characteristics of phylum platyhelminthes as they are able to give influences for human life. By learning more about it, we will be able to maximize the adventages of those animals for our life. At the same time, we will also have an ability to minimize the harmful. Hence, it will be a wise decision for us to do the experiment which was entitled "Platyhelminthes".

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