Put these in order from smallest to largest: organ, cell, organ system, tissue.
- A tissue is made of cells.
- An organ is made of tissues; an organ system is made of organs.
Answer Cell, tissue, organ, organ system
GCSE Combined Science revision · Biology: cells, organisation and disease
The idea
Cells are the building blocks of all living things. A tissue is a group of similar cells with a similar function. An organ is a group of tissues working together for a specific function. Organ systems are organs working together, forming organisms. The stomach, for example, contains muscular, glandular and epithelial tissue.
- Start at the smallest level.
- Name each level in order.
- Give an example of each.
Watch out The stomach is an organ, not a tissue: it is made of several tissues.
See it worked
Your turn
What is a tissue?
Which is an organ?
Name the three tissues in the stomach and give a function of one.
Write your answer, then see a model answer
- Name the tissues.
- Give one function.
Answer Muscular tissue churns food, glandular tissue produces digestive juices and epithelial tissue covers the inside and outside.
In past papers
2 official questions in 2 papers since 2022. The latest:
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