BSsqans-lect12 pseudo

BSsqans-lect12 pseudo - BIS 1B (Winter 2008) Study question...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BIS 1B (Winter 2008) Study question answers: Pseudocoelomates- Nematoda Lecture 12 1. List 4 major features (there are several more) shared in common among the 9 Pseudocoelomate phyla. A blastocoel originating in the developing embryo and which persists in to the adult stage, bilateral symmetry, no repeated body segments, three germ layers (triploblastic). 2. Define the Pseudocoelomate condition and compare that with the Acoelomate and Eucoelomate conditions. Pseudocoelomates have a body cavity space between enteron or gut and the body wall but without a complete mesodermal peritoneal lining. This then is an intermediate condition between the acoelomate condition (e.g. Platyhelminthes) and the eucoelomates (e.g. Chordates). Acoelomates have no body cavity and the gut and other internal organs are contained in a solid mass of mesodermal parenchyma. Eucoelomates on the other hand have a body cavity completely lined in mesoderm with the ectodermal, mesodermal and endodermal organs lined with mesodermal peritoneum and suspended in mesodermal mesenteries. 3. Discuss parenchyma in the context of invertebrate structure and in the context of vertebrate structure. Parenchyma has two meanings, referring to a spongy mass of mesenchyme
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/15/2008 for the course BIS 1b taught by Professor Kimsey during the Spring '08 term at UC Davis.

Page1 / 2

BSsqans-lect12 pseudo - BIS 1B (Winter 2008) Study question...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online