Which statement correctly summarizes the primary role of the Malpighian tubules in the formation of pre-urine in insects?

+3 votes

 

K+ ions are actively secreted into the lumen of the Malpighian tubules; other electrolytes, water, and waste products follow passively.

Cl¯ is actively transported into the lumen by the actions of chloride cells; Na+, waste products, and water follow.

Na+ and Cl¯ ions are actively transported into the lumen of the Malpighian tubules; water and waste products follow.

Waste products such as uric acid are actively secreted into the lumen, and water follows.

 

asked Dec 31, 2012 in Biology by anonymous
    

1 Answer

+1 vote

 

K+ ions are actively secreted into the lumen of the Malpighian tubules; other electrolytes, water, and waste products follow passively.

 

answered Dec 31, 2012 by CaptainTeemo ~Expert~ (631 points)



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