Why is it important to understand the urinary, reproductive, and endocrine systems and how they relate to medical terms, components of the body, and common abbreviations?

Urinary system or the excretory system is used to study and observe the mechanism of toxin release, and conservations of essential elements and water.
The reproductive system is studied to observe any disorder in the reproductive organs, or the offspring, during pregnancy.
The endocrine system gives information about the hormones, their action on various conditions, their imbalances and how they can be cured. All the systems of the body are interrelated and have to be studied to maintain the well-being of the humans', 
Medical terms like 
Mamm are used for breast
Mast is used for mastectomy
Neo is for new fetus
Exo is for the exocrine system
Para is used for parathyroid and so on.