Multiple choice

It is well-known that the people doing regular back-breaking exercises may be at increased risk of various respiratory tract infections. The stress induced by extensive exercise can increase susceptibility to infection by

  1. increasing the synthesis of adrenaline

  2. raising the plasma levels of cortisol

  3. increasing the lymph flow

  4. damaging the mast cells

  5. increasing the respiratory rate

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cortisol depresses a range of immune responses.