Weight of placenta at terms :
**Core Concept**
The weight of the placenta at term is a critical indicator of placental development and function. A normal placental weight is essential for adequate fetal growth and development. The placenta's weight is influenced by factors such as fetal growth, maternal nutrition, and placental efficiency.
**Why the Correct Answer is Right**
The average weight of a placenta at term is approximately 470 grams (± 10%), which corresponds to about 10-15% of the fetal birth weight. This measurement is crucial in assessing placental development and function. The placenta's weight is directly related to its surface area, which in turn affects oxygen and nutrient exchange between the mother and the fetus. A well-developed placenta with an adequate weight ensures proper fetal growth and development.
**Why Each Wrong Option is Incorrect**
**Option A:** This option does not provide a specific weight, making it an unsuitable choice.
**Option B:** This option does not accurately reflect the average placental weight at term.
**Option C:** This option is too low and does not account for normal placental development.
**Clinical Pearl / High-Yield Fact**
The weight of the placenta is a significant indicator of fetal well-being and maternal health. A low placental weight may indicate intrauterine growth restriction or placental insufficiency, while an excessively heavy placenta may be associated with maternal hypertension or diabetes.
**Correct Answer: C. 450 grams.**