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? provide two examples of how will these skills you on the job.

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.
Endocrine system giveAll the systems of the body are interrelated and have to be studied to maintain the well-being of the humans', information about the hormones, their action on various conditions, their imbalances and how they can be cured.
Medical terms like 
Mamm are used for breast
Mast is used for mastectomy
Neo is for new fetus
Exo is for the exocrine system and so on.

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.