Living beings are characterized by their three vital functions: nutrition, interaction, and, what we have yet to see in this course, reproduction. This ability to generate other living beings is carried out through the reproductive system.
As in the rest of mammals, the human species has sexual reproduction. There is sexual dimorphism, that is, two sexes, men and women, who differ, in addition to the reproductive system, in other external characteristics. This leads to sexuality, which produces an attraction between individuals of the opposite sex that makes reproduction possible.
Advances in science and medicine have made it possible to reduce mortality and increase life expectancy considerably, especially in the richest areas of the planet, leading to overpopulation. There are also contraceptive methods that prevent overcrowding and unwanted pregnancies, in addition to preventing sexually transmitted diseases (STDs) caused by fungi, bacteria and viruses. In the same way, biotechnology has also advanced in assisted reproductive techniques to allow the birth of children who could not have done it in a natural way.
Therefore, in this Didactic Unit you are going to study the male and female reproductive system, the mechanisms involved in reproduction, contraceptive methods, the main sexually transmitted diseases, and new reproduction techniques. This knowledge is intended to allow you to develop healthy and responsible sexual attitudes and habits.
The reproduction is the biological process that allows the creation of new bodies, transmitting characters from parents to children.
In humans, there are two different sexes, male and female, with different morphological and physiological characteristics, which implies that their reproduction is sexual. Humans are viviparous, the embryo developing inside the mother's uterus.
The fertilization occurs when two sex cells or gametes (male and female) come together to give rise to an egg or zygote cell.
Remember that part of the reproductive system functions are regulated by hormones.
Activity: Review the nutrition function.
Activity: Human reproduction.