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  According to Boyle’s law, the pressure of a gas ________ if the volume of its container increases.  

  When a partial pressure gradient exists for a gas, it will move from the area of its LOWER partial pressure to the area of HIGHER partial pressure.  

  Which of the following is considered a PRIMARY (not secondary) lymphoid organ?  

  Which of the following features is not common to both lymphatic vessels and circulatory veins?  

  The body replaces cells damaged by the virus with scar tissue, which is thick and stiff.  This can result in a condition called “pulmonary fibrosis”, which has been seen in people with COVID-19 and is probably more likely to develop if the lungs are severely affected by the infection.  Pulmonary fibrosis….  

  Like blood, lymph flows both to and from the heart.  

  What prevents the trachea from collapsing?  

  Acidity in human sweat is part of which type of immune system?  

  Air flows out of the body during expiration because…   

  Functions of the spleen include all of those below EXCEPT ________.