Classification of symbioses

Many scientists have attempted to standardize the many conflicting terms that have been used to describe different symbioses, including:

• Ectosymbiosis: The partners remain external to each other, such as in lichens.

• Endosymbiosis: The smaller symbionts are inside the host, but remain extracellular. Most of the time en-dosymbionts are in the digestive tract, or inside particular organs.

• Endocytobiosis is intracellular symbiosis. Symbio-some membranes are the host cell's vacuoles that enclose the symbiont.

• Obligate symbionts are so highly adapted to a symbiotic experience that they cannot live outside of it.

• Facultative symbionts, however, can live in a free-living condition.

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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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