**Core Concept**
Insulin is a hormone secreted by the beta cells of the pancreas, playing a crucial role in glucose homeostasis. It facilitates cellular uptake of glucose, inhibits gluconeogenesis, and promotes glycogen synthesis.

**Why the Correct Answer is Right**
Insulin exerts its effects by binding to the insulin receptor, a transmembrane receptor tyrosine kinase. This interaction triggers a cascade of intracellular signaling pathways, including the PI3K/AKT pathway, which ultimately leads to the activation of glucose transporter type 4 (GLUT4) and the uptake of glucose into cells. Insulin also inhibits the activity of key gluconeogenic enzymes, such as glucose-6-phosphatase and fructose-1,6-bisphosphatase, to reduce glucose production in the liver.

**Why Each Wrong Option is Incorrect**
**Option A:** Insulin's primary action is not to increase blood pressure, as it actually has a vasodilatory effect due to its stimulation of potassium channels and inhibition of sodium-potassium ATPase activity.
**Option B:** Insulin does not directly stimulate the breakdown of triglycerides in adipose tissue; instead, it promotes the storage of glucose as glycogen and the suppression of lipolysis.
**Option C:** Insulin does not have a direct role in the regulation of body temperature; its primary functions are related to glucose metabolism.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that insulin resistance is often associated with hyperinsulinemia, as the body compensates for impaired insulin action by secreting more insulin to maintain glucose homeostasis.

**Correct Answer: C. Insulin does not have a direct role in the regulation of body temperature.**