**Core Concept**
The process of glucose transport across cell membranes involves insulin-dependent and insulin-independent mechanisms. Insulin plays a crucial role in facilitating glucose uptake in cells, particularly in muscle and adipose tissues. This process is mediated by the insulin receptor and the glucose transporter type 4 (GLUT4).

**Why the Correct Answer is Right**
Insulin stimulates the translocation of GLUT4 to the plasma membrane, increasing glucose uptake in cells. This process is essential for glucose homeostasis and is a key aspect of insulin's action in regulating blood glucose levels. The insulin receptor, a tyrosine kinase receptor, triggers a signaling cascade that ultimately leads to the translocation of GLUT4. This process is critical for glucose entry into muscle and adipose cells.

**Why Each Wrong Option is Incorrect**
**Option A:** Glucose transport in the intestine is primarily facilitated by sodium-glucose cotransporters (SGLTs), which are insulin-independent. While insulin may have some effects on glucose absorption in the gut, it is not required for glucose transport in this context.
**Option B:** Glucose transport across the blood-brain barrier is primarily facilitated by glucose transporter type 1 (GLUT1), which is insulin-independent. This process is essential for maintaining normal brain function and is not dependent on insulin levels.
**Option C:** Glucose transport in the kidneys is primarily facilitated by sodium-glucose cotransporters (SGLTs), which are insulin-independent. While insulin may have some effects on glucose reabsorption in the kidneys, it is not required for glucose transport in this context.

**Clinical Pearl / High-Yield Fact**
Insulin resistance, a hallmark of type 2 diabetes, is characterized by impaired glucose uptake in muscle and adipose tissues. This results from a decreased translocation of GLUT4 to the plasma membrane, making insulin therapy a crucial aspect of managing this condition.

**Correct Answer:** A.