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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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.