The six levels, in order
Chemical, cellular, tissue, organ, organ system, organism. This is an introductory way to describe increasing structural complexity in human anatomy.
Tissue is not the same as organ
A tissue combines cells working in a related role. An organ contains multiple tissue types. The stomach, for example, includes more than muscle tissue alone.
One organ can connect to several systems
The six-level sequence is a useful map, not a set of sealed boxes. Organs can contribute to more than one system. This practice asks for the broad sequence rather than assigning every structure to one exclusive category.
Follow a bite through digestion to practice which organs carry food and which supply digestive substances.
Practice it two ways
First, build the sequence without using Reveal. Then use the example selector: name the level before reading the explanation. If you miss a step, reset and explain that transition aloud. The tool records no grade or ability score.
Definitions checked against OpenStax Anatomy and Physiology 2e, section 1.2. Diagram and exercise are original; circles are symbolic, not to scale.
