Which parts secretions are essential for maturation and motility of sperms.

Answer

### Step-by-Step Solution:

1. **Understanding Maturation and Motility**:
- Maturation refers to the ability of sperm to fertilize an egg, which is crucial for reproduction.
- Motility refers to the movement of sperm, particularly how effectively they can swim through the female reproductive tract.

2. **Identifying Relevant Male Reproductive Structures**:
- The male reproductive system includes the testes, where sperm is produced, and accessory glands that contribute to sperm maturation and motility.

3. **Role of the Epididymis**:
- The epididymis is located at the posterior part of the testes. It plays a critical role in the maturation of sperm. The secretions from the epididymis help in enhancing the motility of sperm.

4. **Function of the Vas Deferens**:
- As sperm travel through the vas deferens, they continue to mature. The secretions here also contribute to the overall maturation process.

5. **Contribution of Seminal Vesicles**:
- The seminal vesicles produce seminal fluid, which mixes with sperm to form semen. This fluid is essential for providing nutrients and energy, which supports sperm motility.

6. **Role of the Prostate Gland**:
- The prostate gland secretes prostate fluid, which is another component of semen. This fluid helps to nourish sperm and further aids in their motility.

7. **Composition of Semen**:
- Semen is composed of sperm, seminal fluid from the seminal vesicles, and prostate fluid from the prostate gland. All these components work together to ensure that sperm are mature and motile.

### Final Answer:
The secretions essential for the maturation and motility of sperm come from the epididymis, vas deferens, seminal vesicles, and prostate gland.

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