Which of the following options does not correctly describe an adaptation or mechanism for efficient gas exchange in the tracheal system of insects?
The highly branched network of numerous tracheoles provides a large surface area for diffusion directly to respiring tissues.
In active insects, lactic acid accumulation in muscles draws fluid out of the tracheoles by osmosis, increasing the rate of gas diffusion.
Tracheoles are lined with spiral rings of chitin to keep them open during ventilation, minimizing the diffusion distance to the cells.
Rhythmic pumping movements of the abdomen ventilate the tracheal system, maintaining a concentration gradient for oxygen and carbon dioxide.
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