**Core Concept**
Insulin plays a crucial role in glucose homeostasis by facilitating the uptake of glucose into cells. This process is mediated by the insulin receptor, which triggers a cascade of signaling events that ultimately lead to the translocation of glucose transporter type 4 (GLUT4) to the cell surface. In muscle and adipose tissue, GLUT4 is the primary glucose transporter responsible for facilitating glucose uptake.

**Why the Correct Answer is Right**
The correct answer involves the action of insulin on GLUT4-containing cells. When insulin binds to its receptor on the surface of muscle and adipose cells, it triggers a signaling cascade that activates the protein kinase B (PKB) pathway. This pathway leads to the translocation of GLUT4 vesicles to the plasma membrane, increasing the number of glucose transporters available for glucose uptake. As a result, insulin increases the entry of glucose into these cells, promoting glucose uptake and storage. This process is essential for maintaining normal blood glucose levels.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because insulin does not directly increase the entry of glucose into hepatocytes. Hepatocytes primarily rely on glucose uptake via the glucose transporter type 2 (GLUT2) and are not primarily regulated by insulin-mediated GLUT4 translocation.
* **Option B:** This option is incorrect because insulin does not directly increase the entry of glucose into neurons. Neurons rely on glucose uptake via the glucose transporter type 1 (GLUT1), which is not primarily regulated by insulin.
* **Option C:** This option is incorrect because insulin does not directly increase the entry of glucose into the kidneys. The kidneys primarily reabsorb glucose via the sodium-glucose cotransporter 2 (SGLT2), which is not primarily regulated by insulin.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that insulin resistance, a hallmark of type 2 diabetes, is characterized by impaired GLUT4 translocation in muscle and adipose tissue. This leads to reduced glucose uptake and increased blood glucose levels.

**Correct Answer:** D