Excretion



  • 0_1553949718425_IMG_20190330_181031345~2.jpg
    Ans:2
    What is the meaning of "concentration of plasma"? Has the

    1. volume of plasma in the blood increased or
      2.concentration of Na+ increased in blood?

    Rise in plasma level or Na+ level means high blood pressure. So body should release ANF to lower the blood pressure, isn't it?

    Why is option 2 the ans? Why is opt 1 wrong? Please explain.



  • @anag
    Production of aldosterone (in adult humans, about 20–200 micrograms per day) in the zona glomerulosa of the adrenal cortex is regulated by the renin-angiotensin system. Renin is secreted from the kidneys in response to variations in blood pressure and volume and plasma sodium and potassium levels.



  • @anag
    Blood plasma is a yellowish liquid component of blood that normally holds the blood cells in whole blood in suspension. In other words, it is the liquid part of the blood that carries cells and proteins throughout the body. It makes up about 55% of the body's total blood volume.[1] It is the intravascular fluid part of extracellular fluid (all body fluid outside cells). It is mostly water (up to 95% by volume), and contains dissolved proteins (6–8%) (e.g. serum albumins, globulins, and fibrinogen),[2] glucose, clotting factors, electrolytes (Na+, Ca2+, Mg2+, HCO3−, Cl−, etc.), hormones, carbon dioxide (plasma being the main medium for excretory product transportation) and oxygen



  • @anag
    The atrial natriuretic hormone (ANF) is a cardiac hormone which gene and receptors are widely present in the body. Its main function is to lower blood pressure and to control electrolyte homeostasis.



  • @anag
    It is controlled by ADH, aldosterone & ANF(atrial natriuretic factor)



  • @sunitasaxena But my doubt is: What is the meaning of "concentration of plasma"? Does it mean:
    1.volume of plasma in the blood increased or
    2.concentration of Na+ increased in blood?

    Rise in plasma level or Na+ level rise means high blood pressure. So body should release ANF to lower the blood pressure, isn't it?

    Why is option 2 the ans? Why is opt 1 wrong? Please explain.



  • @anag
    It is increase in concentration of Na+
    Yes ANF is released to lower the bp



  • @sunitasaxena Thanks. So ans should be opt 1 instead of opt2?



  • @anag
    Yes


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