A group of organs working together to perform a particular job in the body is called an organ system.

Here are some examples of organ systems in the human body:

* Digestive system: Breaks down food and absorbs nutrients.

* Circulatory system: Transports blood, oxygen, and nutrients throughout the body.

* Respiratory system: Allows for gas exchange (oxygen in, carbon dioxide out).

* Nervous system: Controls and coordinates body functions.

* Musculoskeletal system: Provides support, movement, and protection.

* Endocrine system: Produces and regulates hormones.

* Excretory system: Removes waste products from the body.

* Reproductive system: Enables reproduction.

Each organ system is made up of different organs that work together to carry out a specific function vital for the body's overall health and survival.