Lacis cells are located at
**Core Concept**
Lacis cells are a type of cell found in the kidney, specifically within the juxtaglomerular apparatus. They play a role in the regulation of blood pressure and electrolyte balance. The juxtaglomerular apparatus is a critical structure for **renin-angiotensin-aldosterone system** regulation.
**Why the Correct Answer is Right**
The correct answer is related to the location of Lacis cells in the kidney. Lacis cells are located near the **macula densa**, which is a group of specialized cells that sense changes in sodium chloride concentration in the distal convoluted tubule.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Lacis cells are not primarily found in this location.
**Option B:** Similarly, this is not the correct location for Lacis cells.
**Option C:** This option is also incorrect as it does not accurately describe the location of Lacis cells.
**Clinical Pearl / High-Yield Fact**
Lacis cells are important for the regulation of blood pressure through their interaction with the **juxtaglomerular cells** and the **macula densa**. Understanding their location and function is crucial for comprehending the pathophysiology of hypertension and kidney disease.
**Correct Answer:** D. juxtaglomerular apparatus