Human placental lactogen , relaxin , progesterone and estrogen are secreted from

Options

A. Placenta
B. corpus luteum
C. ovary
D. interstitial cells

Answer

To solve the question regarding the secretion of human placental lactogen, relaxin, progesterone, and estrogen, we can follow these steps:

### Step 1: Identify the hormones in question
The hormones mentioned are:
- Human placental lactogen
- Relaxin
- Progesterone
- Estrogen

### Step 2: Understand the source of each hormone
1. **Human placental lactogen**: This hormone is produced by the placenta and plays a role in metabolic changes during pregnancy.
2. **Relaxin**: This hormone is also secreted by the placenta during pregnancy and helps in relaxing the uterine muscles and the pelvic ligaments.
3. **Progesterone**: While progesterone is primarily secreted by the corpus luteum during the menstrual cycle, it is also produced by the placenta during pregnancy.
4. **Estrogen**: Similar to progesterone, estrogen is produced by both the ovaries and the placenta during pregnancy.

### Step 3: Determine the primary source for all hormones
While some of these hormones can be secreted by other structures (like the corpus luteum and ovaries), the question specifically asks for the source of all four hormones listed. The placenta is the main source during pregnancy for human placental lactogen, relaxin, and also contributes to the secretion of progesterone and estrogen.

### Step 4: Choose the correct answer
Based on the above analysis, the correct answer is that all these hormones (human placental lactogen, relaxin, progesterone, and estrogen) are primarily secreted from the **placenta**.

### Final Answer
The correct answer is **the placenta**.

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