Biology - Excretory Products and their Elimination Question with Solution | TestHub
Which one of the following is INCORRECT about JGA?
Options:
Answer:
Solution:
The Juxtaglomerular Apparatus (JGA) is a specialized sensitive region formed by cellular modifications in the distal convoluted tubule (DCT) and the afferent arteriole at the location of their contact.
The juxtaglomerular (JG) cells are modified smooth muscle cells primarily located in the wall of the afferent arteriole, not the efferent arteriole. These cells contain granules of the enzyme renin.
The macula densa is a densely packed group of cells in the wall of the DCT where it comes in contact with the afferent arteriole.
Together, the macula densa and JG cells form the JGA.
A fall in glomerular blood flow, glomerular blood pressure, or GFR can activate the JG cells to release renin, which helps in regulating blood pressure and GFR through the Renin-Angiotensin-Aldosterone System (RAAS).
Therefore, the statement claiming JG cells are smooth muscle cells of the efferent arteriole is incorrect.
Answer: Some smooth muscle cells of the Efferent arteriole have granular sarcoplasm and are called juxtaglomerular cells.
