Which of the following describes the function of the skin bag which encloses the testis ?

Options

A. It synthesises and secretes testicular harmones called androgens.
B. It provides nutrition to be germ cells.
C. It maintains the low temperature of the testes necessary fore spermatogenesis.
D. It is made up of a special tissues that helps in erection of the penis to facilitate insemination.

Answer

To answer the question regarding the function of the skin bag that encloses the testes, known as the scrotum, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The skin bag that encloses the testes is called the scrotum. It plays a crucial role in the male reproductive system.

2. **Understand the Function of the Scrotum**: The primary function of the scrotum is to regulate the temperature of the testes. The testes need to be maintained at a temperature lower than the normal body temperature for optimal sperm production.

3. **Temperature Regulation**: The ideal temperature for spermatogenesis (the production of sperm) is about 2 to 4 degrees Celsius lower than the body's internal temperature. The scrotum helps achieve this by allowing the testes to hang outside the body, where the temperature is cooler.

4. **Evaluate the Options**:
- **Option 1**: "It is synthesis and the secretory testicular hormone called androgen." - This is incorrect; the scrotum does not synthesize hormones.
- **Option 2**: "It provides nutrition to germ cells." - This is also incorrect; the scrotum does not provide nutrition.
- **Option 3**: "It maintains the low temperature of the testes necessary for spermatogenesis." - This is correct; this is the primary function of the scrotum.
- **Option 4**: "It is made up of special tissue that helps erection of the penis to facilitate insemination." - This is incorrect; while erectile tissue is involved in erection, it is not the function of the scrotum.

5. **Conclusion**: Based on the evaluation of the options, the correct answer is **Option 3**: "It maintains the low temperature of the testes necessary for spermatogenesis."