Sugars and most amino acids are also passively filtered from the haemolymph via
junctions between the tubule cells, where as amino acids and non-metabolizables and
toxic organic compounds are actively transported into the tubule lumen. Sugars are
reabsorbed from the lumen and returned to the haemolymph. The continuous secretory
activity of each Malpighian tubule leads to a flow of primary urine from its lumen towards
and into the gut. In the rectum, the urine is modified by removal of solutes and water to
maintain fluid and ionic homeostasis of the body
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