Multiple choice

When does rapid release of CO2 in the atmosphere take place in discontinuous respiration of a cockroach?

  1. Closed phase

  2. Open phase

  3. Flutter phase

  4. Rest phase

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

Rapid release of CO2 in the atmosphere takes place in the open phase. During the open phase, spiracular muscles relax and the spiracles open completely.