Examlex
An M star is hotter than an O star.
Autonomic Nervous System
The part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.
White Blood Cells
Cells in the blood that are involved in protecting the body against both infectious disease and foreign invaders.
Immune System
The body's defense mechanism against infections, diseases, and other foreign bodies.
Antigens
Substances that the body recognizes as foreign and that elicit an immune response.
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