Which of the following is NOT listed as a component of the immune system's physiology?

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Digestive enzymes belong to the digestive system, not the immune system. The immune system’s physiology includes lymphatic organs such as lymph nodes, spleen, thymus, and bone marrow; immune cells like B lymphocytes that produce antibodies; and the complement system, a cascade of plasma proteins that supports defense against pathogens. While the gut environment can influence immunity, digestive enzymes themselves do not constitute a component of immune system physiology. Therefore, digestive enzymes are not listed as part of the immune system’s physiology.