Where is testosterone secreted in the body of the human male? Give a brief account of the role of testosterone - Leaving Cert Biology - Question 13 - 2005

Testosterone plays a crucial role in the development of secondary sexual characteristics such as increased muscle mass, deepening of the voice, and growth of facial and body hair. It also contributes to the production of sperm and maintains libido.

The diagram should include the testis, associated duct (vas deferens), penis, and any other relevant structures. Labels should clearly indicate each part.

Sperm are produced in the seminiferous tubules located within the testis.

1. Sperm are typically smaller and motile, while ova are larger and non-motile.
2. Sperm carry either an X or a Y chromosome, whereas ova carry only an X chromosome.

The prostate gland is responsible for secreting seminal fluid.

Seminal fluid provides nutrients to the sperm, lubricates the reproductive tract, and helps to protect sperm from the acidic environment of the female reproductive system.

Contraception refers to the prevention of fertilization (conception) or implantation of a zygote in the uterus.

An example of a surgical method of male contraception is a vasectomy.
Advantage: It is a simple procedure which avoids side effects associated with hormonal contraception.
Disadvantage: It is not easily reversed and may lead to permanent infertility.

1. Chemical contraceptives (e.g., birth control pills).
2. Barrier methods (e.g., condoms).
3. Intrauterine devices (IUDs).

One possible effect may be a decrease in population growth rates, leading to improved quality of life and socio-economic conditions as families have more control over their reproductive choices.