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A tissue is a group of cells with similar structure and function working together to perform a specific task. Free notes and 14 questions answered.
From Cells to Organisms is part of Principles of organisation in GCSE AQA Higher Biology.
3 min
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14
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GCSE AQA Higher
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A tissue is a group of cells with similar structure and function working together to perform a specific task. Free notes and 14 questions answered.
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Use this lesson to stay inside Principles of organisation while connecting the detail back to the wider Organisation topic.
Read the core explanations from From Cells to Organisms before testing yourself from memory.
Your body contains roughly 37 trillion cells. Every single one started from just one fertilised egg cell. How does nature build something as complex as you from such simple beginnings?
The answer lies in organisation. Life follows a clear hierarchy - from the tiniest cell to the complete organism. Understanding this hierarchy is crucial for GCSE Biology because it explains how structure relates to function at every level.
Trap: Many students think cells are just 'bags of stuff'. Actually, cells are highly organised with specific structures (organelles) that perform different jobs - just like organs in your body.
A single cell can only do so much. To build complex organisms, cells specialise. Picture a factory where each worker has a specific job - that's how tissues work.
Think of muscle tissue in your arm. Thousands of muscle cells work together, all with the same job: contract when stimulated. Each cell is specialised for this function - they're long, contain lots of protein fibres, and can change length rapidly.
Tissues are powerful, but they need support. Your heart muscle tissue can contract, but it needs blood vessels to supply oxygen and nerves to control the rhythm. This is where organs come in.
Take your stomach as an example. It contains muscle tissue (to churn food), glandular tissue (to produce acid and enzymes), epithelial tissue (to line the stomach), and nervous tissue (to coordinate everything). Each tissue type has a different job, but they all work together for one purpose: digesting food.
Even organs need teamwork. Your heart is amazing at pumping blood, but it's useless without blood vessels to carry that blood around your body. This is why organs group together into systems.
The digestive system shows this perfectly. Your mouth breaks down food, your stomach churns and adds acid, your small intestine absorbs nutrients, and your liver processes what you've absorbed. Each organ has a specific job, but they must work in sequence for digestion to succeed.
Now you can see the complete picture. Life is organised in levels, each building on the last:
Cells → Tissues → Organs → Organ Systems → Organism
Worked example: Tracing the Hierarchy: From Muscle Cell to Movement
Describe how a muscle cell in your arm contributes to you lifting a book, using the organisational hierarchy.
Answer: A single muscle cell contraction, amplified through tissue organisation and coordinated by organ systems, enables the whole organism to perform complex actions.
Exam questions on organisation often test whether you can distinguish between the different levels. Here's how to nail them every time.
Exam depth extension: In from cells to organisms, connect the building blocks of life to from cells to tissues using clear cause-and-effect statements. When you explain biological processes, include what changes, why it changes, and the consequence for cells, organisms, or populations. If calculations appear, show each step, include units, and end with a sentence that interprets the result in biological context.
Common exam mistake: Students often confuse tissues and organs. Remember - if it contains different types of cells working together, it's an organ. If it contains similar cells, it's a tissue.
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-20.
Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
A tissue is a group of cells with similar structure and function working together to perform a specific task. Examples include muscle tissue, nerve tissue and epithelial tissue; in muscle tissue, thousands of muscle cells all have the same job: contract when stimulated.
A cell is the basic structural and functional unit of all living organisms. All cells contain genetic material and can carry out the seven life processes, and they are highly organised, with organelles that perform different jobs.
An organ is a structure made of different tissues working together to perform a particular function. The stomach is an organ containing muscle, glandular, epithelial and nervous tissue, all working together to digest food.
The human body contains roughly 37 trillion cells, and every one of them started from just one fertilised egg cell. These cells are organised into tissues, organs and organ systems to build a complete organism.
An organ system is a group of organs working together to perform complex functions in an organism, such as the circulatory, digestive and respiratory systems. In the digestive system, the mouth breaks down food, the stomach churns it, the small intestine absorbs nutrients and the liver processes what has been absorbed.
Examples of tissues include muscle tissue, nerve tissue, epithelial tissue and glandular tissue. A tissue is a group of cells with similar structure and function working together to perform a specific task, such as muscle cells working together to contract.
Examples of organ systems include the circulatory system, the digestive system and the respiratory system. An organ system is a group of organs working together to perform complex functions in an organism.
The stomach contains muscle tissue to churn food, glandular tissue to produce acid and enzymes, epithelial tissue to line the stomach, and nervous tissue to coordinate everything. Each tissue type has a different job, but they all work together for one purpose: digesting food.
Life is organised in levels, each building on the last: cells → tissues → organs → organ systems → organism. Cells are the basic units, tissues are groups of similar cells, organs are made of different tissues, and organ systems are groups of organs working together.
Muscle cells are specialised to contract when stimulated: they are long, contain lots of protein fibres and can change length rapidly. Thousands of muscle cells work together as muscle tissue to produce movement.
A tissue contains similar cells working together, while an organ is a structure made of different tissues working together to perform a particular function. The stomach is an organ because it contains muscle tissue, glandular tissue, epithelial tissue and nervous tissue, all working together to digest food.
The digestive system works as an organ system because its organs work in sequence: the mouth breaks down food, the stomach churns it and adds acid, the small intestine absorbs nutrients, and the liver processes what has been absorbed.
A muscle cell helps lift a book by contracting when stimulated by a nerve impulse; thousands of cells work together as muscle tissue, which forms the bicep muscle with connective tissue and blood vessels. The bicep works with bones and joints in the musculoskeletal system so the whole organism lifts the book.
An organ needs more than one tissue because each tissue type does a different job that supports the main function. Heart muscle tissue can contract, but it needs blood vessels to supply oxygen and nerves to control the rhythm.