Answer:
An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
Explanation:
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Administer a tablet under his tongue and repeat the action in 5 and 10 minutes if the pain has not subsided.
A colonoscopy (if you breakdown the words, large intestines and camera) is a procedure used to view the walls of the colon. Electrocardiograms are used to measure electrical signals of the heart, a stool test or occult test is usually used to determine if their is blood in the stool, and an xray is a diagnostic imaging that passes xrays through the bodies structure.
