Which of the Following Happens in Malpighian Tubules

Question

Which of the following happens in Malpighian tubules? A) K⁺ is secreted into the lumen of the tubule. B) A V-ATPase pumps H⁺ ions. C) Cl^-is secreted into the lumen. D) Two of these. E) None of these.

Accepted Answer

Malpighian tubules function in the excretion and osmoregulation in insects. They secrete waste products into the lumen of the tubule, which includes the secretion of ions like potassium (K+) and hydrogen ions (H+) by a V-ATPase pump, as well as chloride ions (Cl-). Thus, both A and C are processes that occur in Malpighian tubules, making D the correct choice.