how mammary glands are integrated structurally and functionally to support the process of ovulation, fertilization, pregnancy, birth and child care?????

plz explain, these lines are written in NCERT textbook.

The female reproductive system consists of a pair of ovaries alongwith a pair of oviducts, uterus, cervix, vagina and the external genitalia located in pelvic region. These parts of the system alongwith a pair of the mammary glands are integrated structurally and functionally to support the processes of ovulation, fertilisation, pregnancy, birth and child care.

 

This is the paragraph of NCERT and mammary glands alone are not responsible for the processes of ovulation, fertilisation, pregnancy, birth and child care but a pair of ovaries alongwith a pair of oviducts, uterus, cervix, vagina and the external genitalia along with mammary glands are integrated structurally and functionally to take care of these activities in a coordinated manner and mammary glands are involved in child care.

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