Juxtaglomerular Apparatus MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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MEDIUMJuxtaglomerular apparatus is formed by
The function of macula densa is
JGA is the sensitive region between
Which of the following activates the JG cells to release renin?
An increase in blood flow to atria of heart can cause the release of
Concepts Covered - 1
Juxtaglomerular Apparatus
- It is located just adjacent to the vascular pole of the renal corpuscle.
- The DCT comes in direct contact of the afferent and efferent arteriole and that region of the DCT forms the macula densa.
- Macula densa is a cluster of cuboidal epithelial cells that monitors the composition of the fluid that flows through the DCT.
- They respond to the concentration of Na+ in the fluid and release the paracrine signals in the form of ATP and adenosine.
- A second cell type in this apparatus is the juxtaglomerular cell.
- This is a modified, smooth muscle cell lining the afferent arteriole that can contract or relax in response to ATP or adenosine released by the macula densa.
- A second function of the macula densa cells is to regulate renin release from the juxtaglomerular cells of the afferent arteriole.
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