How does ion composition of pre- urine differ from hemolymph?
A) Hemolymph is higher in osmolarity, conserving its Cl- .
B) Pre- urine is significantly higher in osmolarity especially with respect to Na+ and K+) .
C) The protein pumps and channels of the Malpighian tubules concentrate Cl- in the pre- urine.
D) Pre- urine is similar to hemolymph in ion composition.
Correct Answer:
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