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The wall of which of the following parts of the bronchial tree would contain the LEAST amount of smooth muscle?

Immunity that results from vaccination against measles. 

Place the following general steps of pulmonary ventilation in the correct order:  1. Lung volume decreases  2. Diaphragm contracts  3. Intrapulmonary pressure increases  4. Air flows into the lungs

Match each of the following with its most accurate description

High surface tension of the alveoli can interfere with normal ventilation as it increases tendency for alveoli to collapse.  What helps reduce the surface tension of alveoli, which allows for better expansion of the alveoli during inspiration?

The airway diameter  of which of the following parts of the bronchial tree would be the smallest? 

Large clusters of lymph nodes appear in all of the following locations except:

Which of the following is a NOT a  function of the Respiratory System?

Immunity that results from recovery from mumps

A person accidentally swallows water down the “wrong tube”.  The water goes all the way down the trachea to the last ring of the trachea where there is a ridge, called the _____________ which initiates the coughing reflex.