Examlex
Athletes can experience a "runner's high," or euphoria, during strenuous physical activity due to elevated levels of_______.
Submucosa
The layer of the alimentary canal located between the mucosa and the muscular layer.
Nutrients
Substances obtained from food and used by our bodies for growth, energy, and maintaining health.
Mucus
A sticky, slimy substance produced by mucous membranes in the body, acting as a lubricant and protective barrier against foreign particles and microbes.
Enzymes
Enzymes are biological catalysts that speed up chemical reactions in living organisms, playing essential roles in various biochemical processes.
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