The organ system that does not move materials within the body is the endocrine system.

Here's why:

* Endocrine System: This system is responsible for producing and secreting hormones. Hormones travel through the bloodstream, but they don't directly transport other substances. They act as chemical messengers, influencing the function of other organs and tissues.

* Other Systems That Move Materials:

* Circulatory System: Moves blood throughout the body, transporting oxygen, nutrients, and waste products.

* Digestive System: Breaks down food and absorbs nutrients, which are then transported by the circulatory system.

* Respiratory System: Exchanges oxygen and carbon dioxide between the body and the environment.

* Lymphatic System: Collects excess fluid and waste products from tissues and returns them to the circulatory system.

* Urinary System: Filters waste products from the blood and excretes them as urine.

Let me know if you have any other questions!