malinda
Forum Guru
Topics: 162
Posts: 654
|
The clearance of several substances was measured at a constant glomerular filtration rate and constant urine
flow rate, but at increasing plasma concentrations of the substance. Under these conditions, clearance will
increase at high plasma concentrations for which of the following substances?
A. Creatinine
B. Mannitol
C. Penicillin
D. Phosphate
E. Urea
plz explain why u choose what i choose.
___________________
I CAN DO IT.
|
| drk1980
Forum Guru
Topics: 147
Posts: 1,038
|
the mechanism of Tm reabsorption described in the Q is the same used by glucose as well as sodium, aminoacids, ketone bodies, protiens & peptides and Even Phosphate.
IMO, the Q is just testing if you know that list.
anyone else?
|
| skyhigh
Forum Guru
Topics: 105
Posts: 561
|
so urea is ans?
urea is reabsorbed at collecting duct right?
and the rest mentioned above are reabsorbed at the PCT
does this include mannitol and creatinine
Plz correct me.
|
| malinda
Forum Guru
Topics: 162
Posts: 654
|
is it related to all substances transported by fasciliated diffusion which will show Tm?
___________________
I CAN DO IT.
|
| sturge_weber
Forum Guru
Topics: 77
Posts: 1,042
|
i think phosphate is the ans
|
| msyamp
Forum Fanatic
Topics: 60
Posts: 1,462
|
yes phosphate . please give the answer i am dubt ful about urea at this is also having a high Tm
___________________
If you think you can You can! If you think you cant you are right again!!
|
| drk1980
Forum Guru
Topics: 147
Posts: 1,038
|
sturge, ur right
skyhigh, 50% of urea is reabsorbed in the PCT...and that too passively. As i recall, Distal tubule onwards it is impermeable to urea. unless ADH action is present.
malinda, its related to those substances, esp the natural ones listed earlier who are reabsorbed at Tm.
msyamp, are u sure urea is also absorbed by Tm?
|
| malinda
Forum Guru
Topics: 162
Posts: 654
|
yes phosphate is the right answer
___________________
I CAN DO IT.
|
| anjushree
Forum Guru
Topics: 64
Posts: 386
|
urea is passively reabsorb
phosphate is ans
|
| sturge_weber
Forum Guru
Topics: 77
Posts: 1,042
|
well the substances reabsorbed by the tm mechanism re the glucose, peptides, proteins, aminoacids, calcium and phosphate....
urea is only partially reabsorbed by the tm and partially absorbed pssively, hence it cannot be the answer, hence the only answer choice that matches is phosphate
|
|
| |
| | | | | | | | | | |
