A significant amount of progesterone is produce by the

Options

A. Corpus luteum
B. testis
C. Placenta
D. Both A and B

Answer

To solve the question "A significant amount of progesterone is produced by the", we can follow these steps:

### Step 1: Understand the Sources of Progesterone
Progesterone is a steroid hormone that plays a crucial role in the menstrual cycle, pregnancy, and embryogenesis. It is primarily produced in the ovaries, specifically by the corpus luteum after ovulation.

**Hint:** Identify the main sources of progesterone in the human body.

### Step 2: Identify Other Sources
While the corpus luteum is a significant source of progesterone, it is also important to note that the testes (in males) produce some progesterone as well. This production is necessary for the synthesis of testosterone.

**Hint:** Consider both male and female reproductive organs when thinking about hormone production.

### Step 3: Consider the Role of the Placenta
During pregnancy, after the first trimester, the placenta takes over the production of progesterone. This is vital for maintaining the pregnancy and supporting fetal development.

**Hint:** Think about how hormone production changes during pregnancy.

### Step 4: Analyze the Options
The options provided are:
- A: Corpus luteum
- B: Testis
- C: Placenta
- D: Both A and B

Given that the corpus luteum and the testes both produce significant amounts of progesterone, the correct answer must include both.

**Hint:** Look for options that combine multiple sources of hormone production.

### Step 5: Conclusion
Based on the information gathered, the correct answer to the question is "both A and B" since both the corpus luteum and the testes produce significant amounts of progesterone.

**Final Answer:** Both A and B (Corpus luteum and Testis)