SEXUAL REPRODUCTION IN HUMAN

MALE REPRODUCTIVE SYSTEM:

In male reproductive system, there is 1 pair of testis. testis perform dual function. It produces sperm (male gamete ) and produces male sexual harmone, testosterone. It is present outside the abdominal cavity in a fold of skin called scrotum. Scrotum provides 2-3 degree less temperature as compared to the body. From testis originates a tube which carries the sperms called vas deferens.Vas deferens unites with a tube coming from the urinary bladder and forms a common passage called urethra. Prostate gland, cowper's gland and seminile vesicle secretes a fluid which when combines with sperms forms semen. This fluid helps in the transportation of sperms and supply important nutrients to the sperms and maintains the Ph important for their synthesis. 

FEMALE REPRODUCTIVE SYSTEM 

the female reproductive system has two functions :

1. the fertilization of zygote

2. the development of embryo 

the female reproductive system comprises of the following :

1.Ovary: a pair of ovary is present inside the abdominal cavity near the kidney. Like testis, the ovary also perform the dual function of producing the female gamete and producing female sex harmone, estrogen.

2. fallopian tube/oviduct: there are two fallopian tube on both the sides near ovaries. the fertilization takes place in the terminal end of fallopian tube. 

3.Uterus: The two fallopian tubes end up in a elastic muscular bag like structure called uterus. it is where the zygote gets implanted and undergoes development for nine months (called gestation period) 

4. vagina: Also called birth canal (you know why right?) vagina is the one who takes the sperms during sexual intercourse. 

LET'S GET TO THE REAL DEAL- HUMAN REPRODUCTION *evil laugh*

Amazingly when the girl child is born, she contains thousands of the immature eggs. On reaching the puberty (when your body undergoes changes such as cracking of voice in boys and starting of menstruation in girls and secretes respective sex harmone) 10-12 eggs start maturing and only one of the egg is released. the release of egg is called ovulation. The egg is picked up by the fallopian tube where the fertillization occurs. the thousands of sperms which are deposited during sexual intercourse in vagina reach up the fallopian tube and the lucky one reaches the ovum first wins xD i.e. it forms zygote. the zygote slowly moves down to the uterus and gets attached to the wall of unterus this is called implantation. after implantation there is development of a special tissue called placenta.Placenta is a disc like structure between the embryo and walls of  uterus. it has blood villi on the embryo's side and blood space on the mother's side. it gives a surface area for the exchange og glucose and various gases. Also, the excretory and unwanted products from the embryo is also taken from the placenta to the mother's body. so it has dual functions too lol xD. after this after nine months the embryo is slowly brought down to vagina where after rhythemic muscular actions child is finally born *phew*