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Key Definitions

Part of Tissues, Organs and Organ Systems · GCSE GCSE Biology revision

This definitions covers Key Definitions within Tissues, Organs and Organ Systems for GCSE Biology. Organizational hierarchy from cells to organ systems, tissue types in plants and animals, structure-function relationships, and system interactions It is section 9 of 15 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.

Topic position

Section 9 of 15

Practice

20 questions

Recall

22 flashcards

Key Definitions

Cell: The basic structural and functional unit of all living organisms; the smallest unit that can carry out life processes independently.
Tissue: A group of similar cells that work together to carry out a particular function.
Organ: A structure made up of different tissues working together to perform a specific function.
Organ system: A group of organs working together to carry out a major bodily function.
Epithelial tissue: A tissue type consisting of tightly packed cells that line surfaces and cavities; functions in protection, absorption, and secretion.
Organism: A living individual in which all organ systems work together to sustain life.

Keep building this topic

Read this section alongside the surrounding pages in Tissues, Organs and Organ Systems. That gives you the full topic sequence instead of a single isolated revision point.

How It Works: Why Organisation Creates Emergent PropertiesCommon MisconceptionsBuilding Life's ArchitectureLevels of Organisation — Cell → Tissue → Organ → System

Practice Questions for Tissues, Organs and Organ Systems

What is the correct order of biological organisation from simplest to most complex?

  • A. Organ → Tissue → Cell → Organ System
  • B. Tissue → Cell → Organ → Organ System
  • C. Cell → Tissue → Organ → Organ System
  • D. Cell → Organ → Tissue → Organ System
1 markfoundation

Describe the functions of glandular tissue and epithelial tissue in animals.

3 marksstandard

Quick Recall Flashcards

What is a tissue?
A group of similar cells that work together to perform a specific function.
What is an organ?
A group of different tissues working together to perform a specific function.

20 questions on Tissues, Organs and Organ Systems — practise free

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How It Works: Why Organisation Creates Emergent Properties

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Common Misconceptions