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The most important chemical stimulus leading to increased rate and depth of breathing is:

The parietal pleura is superficial to the visceral pleura.

Contaminated mucus is removed from the lower respiratory passageways, such as the trachea, by:

B cells develop immunocompetence in the:

The serous membrane covering the surface of the lungs is called the:

Which one of the following structures is NOT part of the respiratory zone:

The lymph organ that programs T cells and functions at peak levels only during youth is the:

B cells develop immunocompetence in the:

Which of these age-related disorders is related to loss of elasticity of the lungs and hypoxia:

Following the removal of the larynx, a person would be unable to: