--%>
Assignment Help - homework help

Characterization of nervous system-phylum Annelida

How is nervous system characterized in beings of phylum Annelida? How can one compare cephalization in the annelids to cephalization in platyhelminthes and nematodes?

E

Expert

Verified

Annelids contain a nervous system made up of two ventral chords and one comparatively big nervous cell concentration in its anterior part resembling a primitive brain.

Nematodes contain an anterior neural ring joined to two neural chords, a ventral and a dorsal one, whereas in planarias (or platyhelminthes) there are just two small anterior “cerebral” ganglia from which neural chords divide. Cephalization in annelids therefore is more outstanding than in nematodes or in the flatworms.

   Related Questions in Biology

  • Q : In which subphyla are the

    In which subphyla are the protochordates separated? Write down some representatives of each protochordate subphylum?

    		•
  • Q : Angiosperms-flowering plants Describe

    Describe briefly the term angiosperms, flowering plants? And also write down its main feature which distinguishes them from the gymnosperms?

    		•
  • Q : Why carbon monoxide is toxic for humans

    Explain why carbon monoxide is toxic for humans?

    		•
  • Q : Immune memory lead to the efficacy of

    How can the immune memory lead to the efficacy of vaccines and also bring into being allergies?

    		•
  • Q : Sickle cell anemia In sickle cell

    In sickle cell anemia, a genetic disease, there is replacement of one amino acid by other in one of the four polypeptide chains of hemoglobin. In this situation are all structural levels of the protein altered?

    		•
  • Q : Sources of Leader Power Sources of

    Sources of Leader Power: Legitimate power: stems from position in the management hierarchy and the authority given to this position. Reward

    		•
  • Q : Major novelties represented by fishes

    Comparing to cyclostomes (that is, primitive vertebrates) what are the major novelties represented by fishes?

    		•
  • Q : Utilizing Diversity - Organizational

    Firms are realizing that utilizing diversity an all aspects of the workforce makes not only a strong moral sense but also business sense. By ensuring that diversity is built into various groups of members, such as project teams, business start-up teams, customer response teams, sales force and to

    		•
  • Q : Explain Process Modeling Process

    Process Modeling: The word process model is employed in various contexts. For illustration, in Business process modeling the enterprise process model is frequently termed to as the business process model. Process models are core perceptions in the dis

    		•
  • Q : Define Employee Communications Employee

    Employee Communications: Communication is frequently stated as the sharing of information, feelings and thoughts. In business world, exchanging information is necessary for your company's success, and there are numerous different avenues accessible to

    		•