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T helper cells __________. 

Inspiration occurs when the _________ is less than the ________.

Which of the following is responsible for pulling the lungs towards the thorax wall?

Which of the following statements about antibodies is correct (TRUE)?

The most potent respiratory stimulus that influences breathing in a healthy person is __________.

Which of the following statements about inflammation is correct (TRUE)?

Which of the following statements about the lymphatic system is correct (TRUE)?

Which of the following statements about lymph nodes is correct (TRUE)?

Which of the following statements about the thymus is correct (TRUE)?

Flow of lymph through a lymph node slows down because ________.