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How do the nervous,endocrine and reproductive systems perform their coordinated functions in various functions such as pregnancy and childbirth,menstrual cycle,breastfeeding and sexual intercourse?

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The endocrine system serves as the body's network of glands which produces fifty (or more) different known hormones or chemical messengers for the maintenance and proper regulation of bodily functions.  
The endocrine system plays an important role in regulating mood, growth and development, functions of tissues, metabolism, and sexual function and reproductive processes.