All nonspecific defenses have the following in common, EXCEPT A Provide memory to invaders B. Present from birth C. Provide immediate protection D. Work against all potential invaders 28. The trachea A. Has a C shaped cartilages 29. Which of the following cells has the largest role and most widespread effect on immunity? A Antigen presenting coll B. Helper T cell C. Cytotoxic T cell D. B cell 30. The amount of air that can be forcefully exhaled after a normal tidal volume exhalation is A Functional residual capacity 1 B. Expiratory reserve volume C. Inspiratory reserve volume D. Vital capacity
