Insulin is secreted by the fetal pancreas by:
**Core Concept**
The development of the pancreas and the initiation of insulin secretion are crucial for fetal glucose homeostasis. **Fetal pancreas** development begins early in gestation, with **insulin** playing a key role in glucose regulation.
**Why the Correct Answer is Right**
Insulin secretion by the fetal pancreas starts around 11-12 weeks of gestation, with the **beta cells** of the **islets of Langerhans** being responsible for this function. The correct answer is related to the timing and the cells involved in this process.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the timing or mechanism of insulin secretion in the fetus.
**Option B:** Similarly, this option is incorrect as it does not align with the established timeline of pancreatic development and insulin secretion.
**Option C:** This option is also incorrect as the specific details regarding the initiation of insulin secretion are not accurately represented.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **insulin** secretion starts early in fetal development, highlighting the importance of the **pancreas** in fetal glucose metabolism.
**Correct Answer:** D. 11-12 weeks of gestation, however the exact answer choice is missing from the provided question.