REPRODUCTIVE SYSTEM

OVARIES
1FORMATION OF MATURE OVA
2SECRETION OF HORMONES

DEFERENT PHASES OF MENSTRUATION

• Oestrogen secreted by the Graffian follicles
• Progesterone is secreted by corpusluteam
• Relaxin
• Androgen

OESTROGEN

• There are 3 internal ovarian secretions namely a) oestradiol, b) oestrone, c) oestriol
• These are secreted by Graffian follicles
• Secretion beings at the time of ovulation.

FUNCTIONS OF OESTROGEN

• Development and growth of vagina,uterus,Fallopian tubes and ovaries
• Development of uterus endometrium during proliferative stage of menstrual cycle
• Growth of uterus during pregnancy
• Stimulation of fat, protein metabolism
• Skeletal growth is also stimmulated

PROGESTERONE

• It is derived from the corpus lutea
• It is secreted mainly from the ovary but the little is secreted from the placenta and adrenal cortex

FUNCTIONS OF PROGESTERONE

• Premenstrual stimulation of oestrogen
• Prepare the endometrium for menstrual cycle
• Progesterone sustained released during pregnancy
• Protects pregnancy by preventing uterine contraction
• Progesterone is inhibit menstruation during pregnancy

MENSTRUATION

• A cycle phase of the flow of blood,with sheds of endometrium etc., from the uterus of a women at monthly intervals is called menstruation
• It occurs on an average of 28 days interval and last for about 4days.
• It starts from the age of puberty and cycle continuous till menopause

RELAXIN

• It is the hormone present in pregnancy mammalian ovary,placenta and uterus.
• It's level reaches maximum at the terminal stages of pregnancy
• It's useful in affecting parturition

ANDROGEN

• Small amount of testosterone present in females
• It is responsible for development of libido

Untitled Slide