Phylum Acanthocephala Number of families 22
Parasitic thorny headed worms with complex life cycles; sexes separated; adults found in intestines of vertebrates (definitive host), larvae found in hemocoel (body cavity) of arthropods (intermediate hosts) and sometimes in body cavities of vertebrates (paratenic or transport hosts)
Photo: Scanning electron micrograph of the proboscis of Hypoechinorhynchus thermaceri, taken from the eelpout fish Thermarces andersoni, found near deep sea hydrothermal vents. (Photo by Isaure de Buron. Reproduced by permission.)
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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.