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Intestinal systems

A. Schmidt-Rhaesa

in The Evolution of Organ Systems

Published in print:
2007
Published Online:
September 2007
ISBN:
9780198566687
eISBN:
9780191718007
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198566687.003.0012
Subject:
Biology, Evolutionary Biology / Genetics

Animals obtain nutrients using a two-step procedure: food collection and uptake by endocytosis. In eumetazoans, a particular intestinal tract evolved, making it possible to digest food prior to the ... More


The mouth, the anus, and the blastopore—open questions about questionable openings

Andreas Hejnol and Mark Q. Martindale

in Animal Evolution: Genomes, Fossils, and Trees

Published in print:
2009
Published Online:
September 2009
ISBN:
9780199549429
eISBN:
9780191721601
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199549429.003.0004
Subject:
Biology, Evolutionary Biology / Genetics, Developmental Biology

Gastrulation is one of the major events during the embryogenesis of an animal. In addition to the formation of the germ layers it is often the time when the future axial properties and digestive ... More


Producing Life, Conceiving Reason

J. Benjamin Hurlbut

in Experiments in Democracy: Human Embryo Research and the Politics of Bioethics

Published in print:
2017
Published Online:
January 2019
ISBN:
9780231179546
eISBN:
9780231542913
Item type:
chapter
Publisher:
Columbia University Press
DOI:
10.7312/columbia/9780231179546.003.0003
Subject:
Biology, Bioethics

Chapter 2 examines how during the 1980’s the in vitro embryo went from a rare laboratory object to an element of widespread clinical practice. In response to the rapid growth of this largely ... More


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