We have recently also published a study about the function of the gastrointestinal tract of the house cricket. In that study we investigated the presence of an enzyme (carbonic anhydrase, CA) involved in pH regulation. The findings support the suggestion that CA contributes to digestive tract pH gradient, by driving acidic secretions from the salivary glands and alkaline secretions from the midgut. Neither starvation nor sex had any effect on CA activity or localisation.
https://www.wageningenacademic.com/doi/abs/10.3920/JIFF2019.0033