First, the origin and evolution of human beings?

1. Darwin, the founder of evolution, proposed that the common ancestor of human beings and modern apes is forest apes? 2. Human evolution:?

Reason: Forests have disappeared in large numbers. In order to adapt to the environment, arboreal forest apes can gradually walk upright, make and use tools, and finally evolve into humans. ?

Second, human reproduction?

1. Concept: The process of producing germ cells and breeding new individuals is also the process of racial continuation. ? 2. Reproductive system?

1) Structure and function of male reproductive system:

Testis: the main sex organ in men, which produces sperm and secretes androgen?

Epididymis: Located on the back of testis, it stores and transports sperm.

Vasectomy: transporting sperm?

Seminal glands and prostate: Secreting mucus?

External genitalia scrotum: protecting testis and epididymis?

Penis and urethra: sperm excretion and urination?

2) Structure and function of female reproductive system:

Ovary: the main sex organ of women, which produces eggs and secretes estrogen?

Internal genitalia fallopian tube: a place for transporting eggs and fertilizing?

Uterus: A Place for Embryo Development?

Vagina: the channel for menstrual outflow and fetal production?

External genitalia: vulva?

3) Sperm, egg cells and fertilization?

Sperm: male germ cell, small, tadpole-shaped, with long tail, can swim?

Egg cell: female germ cell, spherical, the largest cell in human body, and yolk in cytoplasm provides nutrition for early embryo development?

Fertilization: The process of combining sperm with egg cells to form fertilized eggs. Fertilization site: fallopian tube