1. An exrectory organ must... a. have direct access to blood or other fluids b.
ID: 65006 • Letter: 1
Question
1. An exrectory organ must...
a. have direct access to blood or other fluids
b. have a filtration barrier with pores of atlesat 150nm diameter
c. have a pathway for water and solutes to enter the body
d. use highly pressurized blood to drive urine formation
e. all the above
2. An elasmobranch is an..., which is reflected in its kidney which...
A. osmoconformer...has no loop of henle
B. osmoregulator...has no loop of henle
C. osmoconformer...has no proximal convoluted tubule
D. osmoconformer...has a loop of henle
E. osmoconfermer...has no filtration barrier
3. Solutes...
A. Have same effect on osmolarity whether they are suspended or dissolved in water
B. Follow water movement passively
C. do not have all the same effect on osmolarity, some solutes jave a disproportionate effect
D. all have the same permeability across the cell membrane
E. none of the above
4. How is possible for insects to beat their ings at up to 1,000/s
A. They rely on the elastic recoil of the thorac to help wings beat
B. Their striated muscle is not activated externally by nuerons as is striated muscle in other animals
C. The have very unusual neurons that can fire at rates >2,000 times a second
D. They have a unique striated muscle that is not activated in the same way as vertebrate striated muscle
5. If the maximal intersitial osmolarity around a nephron is 1500 mOsm/L what is the maximal urine osmolarity that can be produced by the nephron (answer in mOsm/L)
A. 3000
B. 300
C. 900
D. 1500
E. Cant be determined
6. What would not affect osmolarity if added to water
A. additional water
B. CO2
C. NaCl
D. H+
E. Sand
Explanation / Answer
1. e all above, 2 d osmoconformer with a henle loop, 3. none of the above, 4D, 5 B 300,, as it is normally 300 always, 6. all the above will affect the change, except "H+ i guess
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