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Name the red vessel. Be specific.

Name the red vessel in the armpit region

Passive immunity results from exposure to an antigen triggering an immune response.

Very prominent mucosa associated lymphoid tissue areas along the inner lining of the small intestine are called ________.

Name the purple vessel

Name the vessel (blue one)

_______ are microscopic, single-celled prokaryotes that cause damage by releasing enzymes and toxins.

Foreign molecules/substances that trigger immune responses by B-lymphocytes and T-lymphocytes are called 

Fever inducing chemicals are called _______.

Name the layer of the vessel wall indicated by the yellow arrow