In adult Schistosoma mansoni and S. japonicum carbohydrate utilization, formation of lactic acid and ATP levels were the same under aerobic and anaerobic conditions. Therefore, these parasites exhibited no pasteur effect. When the metabolic requirements of the parasites were raised by 5-hydroxytryptamine-(5-HT)-induced stimulation of the worm's motor activity, aerobic conditions did not reduce the rate of carbohydrate utilization nor the ATP levels of the worms. Therefore, these parasites do not derive metabolic energy from respiration.
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