Histamine is a mediator of inflammatory responses that is generated by enzymatic cleavage of a plasma precursor
Indicate whether the statement is true or false.
FALSE
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The entire array of protective mechanisms in the respiratory system is called the
A) respiratory immunity. B) macrophage complex. C) respiratory defense system. D) acquired respiratory defense. E) mucus escalator.
All bones stop growing by the end of adolescence
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1. Tidal volume is part of vital capacity. 2. Residual volume is part of vital capacity. 3. Vital capacity is the amount of air that is inhaled and exhaled during normal, quiet breathing. 4. Tidal volume plus residual volume is equal to vital capacity. 5. The inspiratory center is located in the medulla.
Neutralization by antibodies refers to a process through which
a. antibodies buffer the pH of plasma in a way that is inhospitable to invading bacteria. b. antibodies crosslink antigens into chains or clumps, preventing them from exerting their pathogenic effects. c. antibodies combine with bacterial toxins, preventing them from harming susceptible cells. d. none of these.