**Core Concept**
Uterine blood flow increases significantly during pregnancy to meet the growing demands of the fetus. The uterine artery, a branch of the internal iliac artery, is responsible for supplying blood to the uterus. At term, the uterine artery undergoes significant changes to ensure adequate blood supply to the fetus.

**Why the Correct Answer is Right**
Uterine blood flow at term is approximately 500-600 mL/min, which is a 5-6 fold increase from the non-pregnant state. This increase is largely due to the relaxation of the uterine artery smooth muscle, allowing for vasodilation and increased blood flow. The increase in uterine blood flow is also mediated by the production of prostaglandins and other vasodilatory substances by the placenta. The increase in blood flow is crucial for the delivery of oxygen and nutrients to the fetus.

**Why Each Wrong Option is Incorrect**
* **Option A:** Uterine blood flow at term is not significantly decreased compared to the non-pregnant state. In fact, it is increased to meet the demands of the growing fetus.
* **Option B:** The uterine artery does not undergo significant constriction at term. Instead, it undergoes vasodilation to increase blood flow to the uterus.
* **Option D:** The increase in uterine blood flow at term is not primarily due to the compression of the uterine artery by the growing uterus. While compression may occur, it is not the primary mechanism for the increase in uterine blood flow.

**Clinical Pearl / High-Yield Fact**
The increase in uterine blood flow at term is a critical factor in maintaining fetal well-being. Any compromise in uterine blood flow can lead to fetal distress and potentially life-threatening complications.

**Correct Answer: C. 500-600 mL/min**