Question

Flatworms are the first organisms we have discussed with an anterior-posterior orientation. How does this affect their movement compared to the movement of more primitive organisms

Answer 1

Anterior-posterior orientation

Explanation:

Flatworms have an anterior-posterior orientation and as a result more coordinated and deliberate movement is established  

• Flatworms also called Platyhelminthes are a phylum of relatively simple soft-bodied invertebrate animals
• They are the largest phylum of acoelomates and are found in marine,freshwater and even in some damp terrestrial environments
• Movement in some flatworms is controlled by longitudinal,circular and oblique layers of muscle
• Flatworms anterior end helps in moving towards their food while the posterior end ensures that these organisms walk away from irritants