What are organ systems?

• A. A single organ performing a specific job
• B. Groups of organs working together to perform particular complex functions (jobs in the body)
• C. Outer structures forming the body surface
• D. Microstructures within tissues

Answer: (B)

Organ systems are groups of organs working together to perform complex functions in the body. This collaboration lets the body carry out tasks that no single organ could do alone, such as digestion, circulation, or movement as a coordinated whole. For example, the digestive system involves several organs like the stomach, intestines, liver, and pancreas that partner to break down food, absorb nutrients, and eliminate waste. A single organ by itself has a specific role, but it doesn’t constitute a system unless it’s part of this larger, coordinated network. Structures forming the body surface and microscopic components within tissues aren’t organ systems themselves—they’re either layers of tissue or tiny components that don’t describe a coordinated set of organs. So, organ systems are these integrated groups of organs that carry out the body’s complex, interrelated tasks.