Digestive System (Biology)

Summary: The fourth level of organization is an organ system. An organ system is a group of different organs that work together to perform a certain function. Some examples of animal organ systems include: - skeletal system (bones) – gives body shape, allows movement, protects organs - muscular system (muscles) – responsible for movement - gas exchange system (lungs) – takes in oxygen, removes carbon dioxide - digestive system (stomach, intestines) – breaks down and takes in food Molecules - circulatory system (heart, veins, arteries) – transports substances around the body in the blood. Tags: science student-book-7 biology Created: 2026-05-21 Last Updated: 2026-05-21

Digestive System (Biology)

The fourth level of organization is an organ system. An organ system is a group of different organs that work together to perform a certain function. Some examples of animal organ systems include: - skeletal system (bones) – gives body shape, allows movement, protects organs - muscular system (muscles) – responsible for movement - gas exchange system (lungs) – takes in oxygen, removes carbon dioxide - digestive system (stomach, intestines) – breaks down and takes in food Molecules - circulatory system (heart, veins, arteries) – transports substances around the body in the blood.

Source

This concept is from the [Science Student Book 7](Science Student Book 7/Biology/Body Systems/2.1 Levels of organization.md), Biology section.