The endocrine system is responsible for the production of hormones. The nerves carry the hormones to the target site, so that hormone may exert their action. The reproductive system's growth and functions are mainly dependent upon the hormones, which are delivered by the nerves. Once the hormone reaches its target site, they lead to the expression/blocking of certain pathways/products.
Endo-secreting within
Thyro-thyroid
Megaly-enlargement
Crany-skull
Neur-nerve
Gram-record
Gyn-woman
Neo-new
Mast-breast
When you have a positive attitude you're more likely to believe in yourself, thus being more productive due to the confidence.
This is true coming from a health care professional:)