The nervous system is derived from     ectoderm     endoderm     mesoderm     All of the above: it depends on whether the animal is a protostome or a deuterostome      QUESTION 7 Planarians lack dedicated respiratory and circulatory systems because     none of their cells are far removed from the gastrovascular cavity or from the external environment.     they lack mesoderm as embryos and therefore lack the adult tissues derived from mesoderm.     their flame bulbs can carry out respiratory and circulatory functions.     their pseudocoelom carries out these functions.     QUESTION 8 Animals with bilateral symmetry     can be divided into similar halves by any plane through the longitudinal axis.     are usually very slow-moving organisms.     are relatively simple in structure.     are better adapted for forward movement than radially symmetrical organis

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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  1. The nervous system is derived from

       

    ectoderm

       

    endoderm

       

    mesoderm

       

    All of the above: it depends on whether the animal is a protostome or a deuterostome

     

  

QUESTION 7

  1. Planarians lack dedicated respiratory and circulatory systems because

       

    none of their cells are far removed from the gastrovascular cavity or from the external environment.

       

    they lack mesoderm as embryos and therefore lack the adult tissues derived from mesoderm.

       

    their flame bulbs can carry out respiratory and circulatory functions.

       

    their pseudocoelom carries out these functions.

     

 

QUESTION 8

  1. Animals with bilateral symmetry

       

    can be divided into similar halves by any plane through the longitudinal axis.

       

    are usually very slow-moving organisms.

       

    are relatively simple in structure.

       

    are better adapted for forward movement than radially symmetrical organisms.



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