In the Malpighian Tubules of an Insect (Blind,threadlike Excretory Tubule

question 65

Multiple Choice

In the Malpighian tubules of an insect (blind,threadlike excretory tubule attached to the gut of an insect) ,salt molecules are actively transferred from body fluids to the inside of the tubule.Which of the following is NOT true?

• A)Water is also "pulled" by osmosis into the Malpighian tubule.
• B)The concentration of salt is normally higher in the body fluids than it is inside the tubule.
• C)The process decreases the salt concentration of the body fluids.
• D)Insects must excrete excess salt through the Malpighian tubules.
• E)The tubules have the same tonicity as the body fluids.

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