How many of the following structures are found in the primary sex organ of a male ?
(I) The network of small tubules
(II) Leydig cells
(III) Blood vessels
(IV) Seminiferous tubules

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine how many of the listed structures are found in the primary sex organ of a male, we need to analyze each structure in relation to the male reproductive system, specifically the testis.

1. **The network of small tubules**:
- In the testis, there is indeed a network of small tubules known as the rete testis. This network collects sperm from the seminiferous tubules before it moves to the epididymis.
- **Conclusion**: Yes, this structure is found in the primary sex organ.

2. **Leydig cells**:
- Leydig cells, also known as interstitial cells, are located in the interstitial spaces between the seminiferous tubules in the testis. They are responsible for producing testosterone and other androgens.
- **Conclusion**: Yes, this structure is found in the primary sex organ.

3. **Blood vessels**:
- Blood vessels are essential for supplying nutrients and oxygen to the testis and for removing waste products. They are present throughout the testicular tissue.
- **Conclusion**: Yes, this structure is found in the primary sex organ.

4. **Seminiferous tubules**:
- Seminiferous tubules are the coiled structures within the testis where spermatogenesis occurs (the production of sperm). They are a key component of the testis.
- **Conclusion**: Yes, this structure is found in the primary sex organ.

Now, let's summarize the findings:
- The network of small tubules: Yes
- Leydig cells: Yes
- Blood vessels: Yes
- Seminiferous tubules: Yes

All four structures are found in the primary sex organ of a male (the testis).

**Final Answer**: 4 structures are found in the primary sex organ of a male.

---