Which of the following statements about antidiuretic hormone
(ADH) is TRUE?
When ADH is present, large amounts of dilute urine are
excreted.
When ADH is absent, the collecting duct is highly permeable
to water.
When ADH is absent, aquaporins are inserted into the
membrane of the collecting duct.
When ADH is present, the collecting duct is highly
permeable to water.
2. How are the Malpighian tubules in insects involved
in water and electrolyte balance?
They are the openings of the tracheal system, which can be
closed to prevent water loss.
They actively pump water back into the body when the insect is
under osmotic stress.
They form the protective outer surface of the insect, acting as
an exoskeleton.
They form a filtrate consisting of wastes, electrolytes, and
water, which can be reabsorbed in the hindgut.