Page 21 of 21 FirstFirst ... 11192021
Results 501 to 511 of 511
Like Tree115Likes

Thread: HSC Biology Marathon 2015

  1. #501
    Breaking the limits. TQuadded's Avatar
    Join Date
    Sep 2014
    HSC
    2015
    Gender
    Male
    Location
    In a parallel universe.
    Posts
    342
    Rep Power
    3

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by Loudvicuna View Post
    Explain how hormone activity maintains water and salt levels in the blood. (5 marks)
    Salt and water regulation is maintained with the help of hormones such as aldosterone and anti-diuretic hormones. When water levels in the blood/body is low, osmoreceptors detect this and sends this signal to the brain. The brain recognises the effective method of counteracting this change through releasing anti-diuretic hormones from the hypothalamus. This hormone travels to the kidney in order to make the membrane more permeable to water, increasing the reabsorption of water, and therefore counteracting the low water levels. After the water levels return to normal, the brain halts the production of anti-diuretic hormones.

    That's all I can write on my iPhone. My hands are dead, sorry. Someone finish it please. XD
    Mr_Kap likes this.



    "Half of the things you read on the internet are not true at all." - Adolf Hitler


    2015 MINIMUM GOAL:
    Advanced English (75) | Biology (86) | Mathematics (89) | Chemistry (89) | Mathematics Extension (80) | Physics (86)
    ATAR Goal (90.00) | Actual ATAR (85.25)
    Bachelor of Engineering / Applied Leadership and Critical Thinking | Western Sydney University (Parramatta Campus)




  2. #502
    Executive Member
    Join Date
    Mar 2015
    HSC
    2015
    Gender
    Male
    Posts
    1,133
    Rep Power
    2

    Re: HSC Biology Marathon 2015

    all right then I guess thats it then.

    THANKS TO EVERYONE that contibuted to these 21 pages, with their questions and answers. I have no doubt learnt a lot through this thread. Thanks BlueGas for starting this thread and for everyone that has kept it going (especially since trials)..special mentions to BueGas,Flop21,FlyingKanga, Chris_S and DepressedPenguino, Rand_althor and also mentions to TQuadded and tfw english (over the last week), , Khan.Paki, Queenroot, and anyone else i have forgottton. Thx for all the help guys
    .

    Let's do this guys. LETS SMASH THE EXAM TOMORROW!!!!!!!!!
    WE ARE 2015'ers, LETS DO OUR COHORT PROUD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Watch out bio exam, ure gonna get rekt:

    And remember: "What do Biology students do to their notes after the HSC?"
    THEY BURNET!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Last edited by Mr_Kap; 19 Oct 2015 at 12:03 AM.
    Advanced Science & Computer Science - UNSW

    "Give a man a fire, and he's warm for a day.
    Set man on fire, and he's warm for the rest of his Life!"

  3. #503
    Senior Member
    Join Date
    May 2015
    HSC
    2015
    Gender
    Male
    Posts
    554
    Rep Power
    2

    Re: HSC Biology Marathon 2015

    Good luck everyone!

  4. #504
    Senior Member
    Join Date
    May 2015
    HSC
    2015
    Gender
    Male
    Posts
    554
    Rep Power
    2

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by TQuadded View Post
    Salt and water regulation is maintained with the help of hormones such as aldosterone and anti-diuretic hormones. When water levels in the blood/body is low, osmoreceptors detect this and sends this signal to the brain. The brain recognises the effective method of counteracting this change through releasing anti-diuretic hormones from the hypothalamus. This hormone travels to the kidney in order to make the membrane more permeable to water, increasing the reabsorption of water, and therefore counteracting the low water levels. After the water levels return to normal, the brain halts the production of anti-diuretic hormones.

    That's all I can write on my iPhone. My hands are dead, sorry. Someone finish it please. XD
    The hypothalamus doesn't release ADH, it stimulates the pituitary gland to do so. Also be specific in that it acts to increase the permeability of the membranes of cells lining the distal and collecting tubules to water.

    For aldosterone: a decrease in sodium ion concentration leads to a decrease in blood volume which causes the adrenal gland to secrete aldosterone. Once aldosterone reaches the kidney, it increases the permeability of the nephron to sodium, particularly in the ascending limb of the Loop of Henle. Sodium ions are thus conserved, which also causes water to be conserved.
    Mr_Kap likes this.

  5. #505
    Junior Member
    Join Date
    Jun 2014
    HSC
    2015
    Gender
    Male
    Location
    Sydney
    Posts
    178
    Rep Power
    3

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by rand_althor View Post
    The hypothalamus doesn't release ADH, it stimulates the pituitary gland to do so. Also be specific in that it acts to increase the permeability of the membranes of cells lining the distal and collecting tubules to water.

    For aldosterone: a decrease in sodium ion concentration leads to a decrease in blood volume which causes the adrenal gland to secrete aldosterone. Once aldosterone reaches the kidney, it increases the permeability of the nephron to sodium, particularly in the ascending limb of the Loop of Henle. Sodium ions are thus conserved, which also causes water to be conserved.
    Breh the 2 questions you asked were the exact same in the exam, thanks lol
    rand_althor likes this.

  6. #506
    Supreme Member Flop21's Avatar
    Join Date
    May 2013
    HSC
    2015
    Gender
    Female
    Posts
    2,859
    Rep Power
    5

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by rand_althor View Post
    Not enough differences. You could also mention:
    - Blood flows in one direction in arteries, capillaries and veins, whereas phloem sap direction can vary
    - Blood moves in different vessels (arteries, capillaries, veins) whereas phloem moves in sieve tubes
    - Phloem carries products of photosynthesis whereas blood moves many substances such as carbon dioxide, oxygen etc.
    This was in the exam lol, well pretty close to the question in the exam..........
    2015 HSC: English Adv, Mathematics, Business Studies, Biology, Multimedia.

    HSC Biology Flashcards

  7. #507
    Breaking the limits. TQuadded's Avatar
    Join Date
    Sep 2014
    HSC
    2015
    Gender
    Male
    Location
    In a parallel universe.
    Posts
    342
    Rep Power
    3

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by Flop21 View Post
    This was in the exam lol, well pretty close to the question in the exam..........
    I put:

    - Phloem vs. Blood vessel
    - Sugar & water vs. Sugar, water, nitrogenous wastes, carbon dioxide
    - Pressure flow theory vs. Pumping of the heart



    "Half of the things you read on the internet are not true at all." - Adolf Hitler


    2015 MINIMUM GOAL:
    Advanced English (75) | Biology (86) | Mathematics (89) | Chemistry (89) | Mathematics Extension (80) | Physics (86)
    ATAR Goal (90.00) | Actual ATAR (85.25)
    Bachelor of Engineering / Applied Leadership and Critical Thinking | Western Sydney University (Parramatta Campus)




  8. #508
    Senior Member
    Join Date
    May 2015
    HSC
    2015
    Gender
    Male
    Posts
    554
    Rep Power
    2

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by Loudvicuna View Post
    Breh the 2 questions you asked were the exact same in the exam, thanks lol
    No worries man, was pretty surprised when I saw those.

  9. #509
    New Member
    Join Date
    Jun 2014
    HSC
    2014
    Gender
    Male
    Posts
    24
    Rep Power
    3

    Re: HSC Biology Marathon 2015

    ADH is produced in the hypothalamus and stored in the posterior pituitary
    ATAR: 99.40


    The Overnight Student by Michael L. Jones - good read

  10. #510
    New Member
    Join Date
    Oct 2015
    HSC
    2016
    Gender
    Female
    Posts
    3
    Rep Power
    2

    Re: HSC Biology Marathon 2015

    Could someone please define constant internal environment?

  11. #511
    Exalted Member BlueGas's Avatar
    Join Date
    Sep 2014
    HSC
    N/A
    Gender
    Male
    Posts
    2,344
    Rep Power
    4

    Re: HSC Biology Marathon 2015

    Quote Originally Posted by Mazza12 View Post
    Could someone please define constant internal environment?
    Do you mean homeostasis or what is a body's constant internal environment? This is quite broad as a constant internal environment can consist of many things such as oxygen levels, CO2, blood sugar levels and so on.

Page 21 of 21 FirstFirst ... 11192021

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •