A few biology questions that I need help with?

Question

In the loop of Henle

A. filtrate is produced.
B. water osmoses into the descending limb.
C. sodium and chloride ions are actively transported out of the ascending limb.
D. the ascending limb is very permeable to water.
E. the filtrate in the descending limb becomes more and more hypotonic.

ANOTHER QUESTION

In response to high plasma osmolarity,

A. there is an increased transport of sodium ions from the lumen of the collecting duct into the renal medulla.
B. the vasa recta carry the extra solute into the medulla of the kidney where it diffuses into the interstitial space.
C. secretion of ADH is suppressed.
D. there is an increased permeability of the membrane of the renal collecting ducts to water.
E. the osmolarity of the urine will decrease

Answer 1

C. http://rds.yahoo.com/_ylt=A0geu.S0trJG5XQBhbdXNyoA;_ylu=X3oDMTFhdDhtaTF1BHNlYwNzcgRwb3MDMTQEY29sbwNhYzIEdnRpZANGODIyXzExMQRsA1dTMQ--/SIG=12g3jiie9/EXP=1186203700/**http%3a//ttb.eng.wayne.edu/~cavanau/bme5010/f2000/renphy1.html