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CBSE Class 11-science Answered

How can we easily understand ras from the given example? Any key words is there for ras?

Asked by asokworld | 30 Dec, 2019, 07:31: PM
Expert Answer

 

  • Juxtaglomerular Apparatus (JGA) operates viw multihormonal system called Renin-Angiotensin-Aldosterone-System (RAAS).
  • When there is a decrease in the GFR, JGA activates and secretes renin.
  • Renin converts angiotensinogen (protein) into angiotensin (peptide).
  • Angiotensin is a hormone which raises the blood flow and the GFR in the following three ways:

 

  1. Constrict efferent arterioles to increase the glomerular pressure
  2. Stimulate the walls of PCT to reabsorb more NaCl and water
  3. Stimulates the adrenal gland to produce aldosterone, which promotes reabsorption of NaCl and water in DCT
  • This results in an increase in blood pressure and blood volume and a decrease in urine volume and hypertonic urine.
 
Answered by Sheetal Kolte | 31 Dec, 2019, 12:26: PM
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