Phylum Chordata Class Cephalochordata Number of families 1

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Exclusively marine species with slender, fish-like shape, tapered at both ends; easily recognized by the externally visible v-shaped lines that separate the iterated muscle blocks and by the oral cirri that guard the mouth opening against unwarranted particles

Photo: Lancelet (Amphioxus lanceolatus) larva head. Lancelets have no heart but do have gills. (Photo by Animals Animals ┬ęP. Parks, OSF. 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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