Thursday 28 June 2012

REPRODUCTION IN HUMANS



Puberty: The period during which adolescents reach sexual maturity and become capable of reproduction.


Secondary sexual characters in human beings...(Changes that indicates sexual maturity).
Secondary sexual characters in Male....
Enlargement if penis & glands of the reproductive tract.
Increased muscle development.
Enlargement of larynx,So deepning of voice.
Growth of public hairs,extra hair on face, And also at the arm pits & on the chest.

Secondary sexual characters in Female...
Growth of Breasts and external genetalia.
Broadning of pelvis.
Typical feminine contour due to increase in deposits of fats in thighs & face.
Growth of public and axillary hair.
Initiation of mensturation and ovulation.

Menstrual Cycle: The process of ovulation and menstruation in women and other female primates,like monkeys and apes.

Oestrous Cycle: A recurring period of sexual receptivity and fertility in many female non-primate mammals. Eg: Cow,dog,rat,cat,etc...

Seasonal breeders:animals living in natural wild conditions breed only at favorable seasons.

Continuous breeders: Animalsthat breed throughout their reproductive phase.Eg: Deer,Goat etc...

Senescence: It begins at the end of reproductive phase.Growth deteriorates with age.

Fertilisation:It is the process of fussion of sperm and egg to form the zygote.

Sperm + egg = Zygote


Embryogenisis: The formation of the embryo from the zygote and its development.

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