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  1. S

    A level Biology: Post your doubts here!

    So it's not like what panda said above? that it does secret both the times , but it only matters the second?there is a great resistance when the alveoli expand, but what does that have to do with the blood vessels?.. thanks a lot for the help:D
  2. S

    Mathematics: Post your doubts here!

    Pleaseee I need help in question 3d Maj/June 2010 42 , can some explain how to find n?
  3. S

    A level Biology: Post your doubts here!

    Can some one please clear my doubts? Why does the mosquito have to secrete an anticoagulant the second time into an uninfected person but not the first? Why there is an increase in the resistance in the blood vessels surrounding the lungs of an emphysema patient? What is the difference between...
  4. S

    Mathematics: Post your doubts here!

    Can some one please explain how to find n in Maj/June 2010 42 variant question 3d ??
  5. S

    A level Biology: Post your doubts here!

    any time :D
  6. S

    A level Biology: Post your doubts here!

    OH my GOD we wrote at the same time XD
  7. S

    A level Biology: Post your doubts here!

    It occurs during high partial pressure of carbon dioxide during muscle activity , which reduces the percentage saturation of hemoglobin because , the carbon dioxide diffuses into the red cells and with the aid of the enzyme carbonic anhydrase it reacts with water forming carbonic acid , the...
  8. S

    A level Biology: Post your doubts here!

    Oops my bad I meant shouldn't be More , but I think I got it , so the volume remains equal but the composition of air changes right?
  9. S

    A level Biology: Post your doubts here!

    Thanks a lot for the info.
  10. S

    A level Biology: Post your doubts here!

    Thanks for the help , I didn't even figure out it's a RBC , I know a rbc is biconcave , but it looks to me like a triangle more than anything XS
  11. S

    A level Biology: Post your doubts here!

    can someone please explain how the features of this blood vessel make a capillary ?? It's in question paper Maj/June 2012 variant 3 paper 2 question 1
  12. S

    A level Biology: Post your doubts here!

    So the stroke volume is not directly proportional to the ventricular end-diastolic volume , okay I got it , thanks a lot for the help :D
  13. S

    A level Biology: Post your doubts here!

    Oh I forgot that , it's 2012
  14. S

    A level Biology: Post your doubts here!

    Can some one please explain question 30 p1 Maj/June variant 2 ?
  15. S

    A level Biology: Post your doubts here!

    Y yeah you're right hehe , but what does the S mean 0.o?
  16. S

    A level Biology: Post your doubts here!

    How is carbon dioxide found in tissues fluid?o_O
  17. S

    A level Biology: Post your doubts here!

    What do they mean when they say 70S for ribosomes? what's the meaning of the "S"?
  18. S

    A level Biology: Post your doubts here!

    I measure the height of the cell by calibrating it? this is necessary in plan diagrams? I should always do it?
  19. S

    A level Biology: Post your doubts here!

    So w so what you mean is the volume of air exchanged is the also the volume of air inhaled? but how can the air inhaled be equal to the air exhaled shouldn't it be less ? X_X
  20. S

    A level Biology: Post your doubts here!

    But why did they refer to the volume of air absorbed as the volume of air exchanged , because the more air was exchanged in each breath , the more would be absorbed right? oh ok I think I got it. Thank you so much for the help :D
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