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Various things you need to know for your high school biology midterm


Any agent that can cause disease

Koch's Postulates

Rules for determining the cause of a disease
1. The pathogen must only present in an animal that has the disease.
2. The pathogen must be isolated from the sick animal and grown in a laboratory.
3. When the isolated pathogen is injected into a healthy animal, that animal must develop the disease.
4.The pathogen taken from the second animal must be the same as the first one after being isolated and grown.


A substance that increases blood flow to an injured area and increases the









B Cell


T Cell








Autoimmune Disease


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