Questions: Identify the role of the nervous system in the functions of the male reproductive system. Development of reproductive structures Spermatogenesis Development of secondary sex characteristics Sexual act and behavior

The answer is the fourth one: Sexual act and behavior.

Explanation for each option:

1. Development of reproductive structures: This process is primarily governed by hormonal signals, particularly during embryonic development and puberty. While the nervous system plays a role in overall body regulation, it is not the primary driver of the development of reproductive structures.

2. Spermatogenesis: This is the process of sperm production, which is mainly regulated by hormones such as testosterone and follicle-stimulating hormone (FSH). The nervous system has an indirect role through the regulation of these hormones but is not directly responsible for spermatogenesis.

3. Development of secondary sex characteristics: These characteristics, such as facial hair and a deeper voice, are also primarily regulated by hormones, particularly testosterone. The nervous system influences hormone levels but does not directly cause the development of secondary sex characteristics.

4. Sexual act and behavior: The nervous system plays a crucial role in the sexual act and behavior. It is responsible for the physiological responses during sexual activity, such as arousal, erection, and ejaculation, through the autonomic nervous system. Additionally, the brain regulates sexual behavior and desire.

Summary: The nervous system is directly involved in the sexual act and behavior, making the fourth option the correct answer.