Biobehavioral Influences on Respiratory Immunity
An adult breathes about 12,000 liters of air per day.
Solid and fluid food passes through the oral cavity and pharynx, which is the common part of the respiratory and digestive tract.
The moist and warm milieu in the upper respiratory tract offers an ideal climate for microorganisms.
KeywordsCommon Cold Secretory Component Systemic Immune System sIgA Concentration Local Immune System
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