Phylum Nematoda Class Adenophorea Number of families 96

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Primarily free-living marine, freshwater, and terrestrial nematodes; considered to be the most primitive form of nematodes

Photo: Trichina worm (Trichinella spiralis) in muscle tissue section. (Photo by Bob Gossington. Bruce Coleman, Inc. Reproduced by permission.)

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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