Learning Objectives The next time you burn or cut yourself, make a note of the symptoms you observe in the damaged tissue. You will observe…
Learning Objectives Host defenses can be divided into two categories, innate and adaptive immunity. Innate immunity involves general mechanisms in a healthy animal that prevent…
Learning Objectives The Immune System Is a Complex Collection of Organs, Tissues, and Cells The immune system consists of a complex network of organs and…
Learning Objectives Before we begin an examination of the immune system it is worthwhile to consider whether an animal is even susceptible to a disease.…
Learning Objectives Where It Came From Almost all eukaryotic organisms have some way of dealing with the pathogenic microbes in the environment. Even unicellular eukaryotes…
From a microbe’s point of view, our bodies are excellent places to live and as a result we are covered with microorganisms. Most of these…
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