Examlex
Structures that are below the surface or inside the body are ________.
Immune System
The body's defense mechanism against pathogens, including various cells, tissues, and organs that fight infections and diseases.
Antigens
Substances that the body recognizes as foreign and that elicit an immune response, often found on the surface of pathogens like bacteria and viruses.
Glucose
A basic form of sugar that serves as a significant source of energy for living beings and is found in numerous carbohydrates.
Red Blood Cells
Cells in the bloodstream that carry oxygen from the lungs to the body's tissues and return carbon dioxide from the tissues back to the lungs.
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