As we know your body is made of thousands of specialised cells, each performing a task to keep you alive.

In our bodies we have levels of organisation.

Notice the pyramid above. This shows us the levels of organisation, and the amount in each level.

As we know, we are multi-cellular organisms. This means we are made up of many different types of cells, each performing a specific task to keep us alive.

Neurons, muscle cells, red blood cells, white blood cells, fat cells and skin cells are all examples of specialised cells found in our bodies.

Click here for more information on specialised cells.

Tissues are the second level of organisation.

A group of similar cells working together to perform a specific function is called a tissue.

Muscle tissue, nervous tissue, connective tissue and epithelial tissue are all forms of tissue

Blood although is a fluid is actually classified as a tissue.  

Another important tissue in plants, is the xylem and phloem.

They are tubes which assist in the movement of nutrients up and down the plant.

The Xylem transports water from the roots up to the leaves of the plant, while the phloem transports sugar and proteins down the plants.

Organs

Various tissues make up a single organ. The stomach can be made up of smooth muscle tissue, epithelial tissue and connective tissue.

These tissues work together to complete a specific function.

Organ Systems

Different organs working together create an organ systems. These organs work together with a common goal.

Click on the systems to learn more

Circulatory system

Respiratory System

Nervous system

Skeletal system

Muscular system

The image below is a microscopic view of a cross section of a plant.

Can you spot all the Cell, tissues and organ.

Questions

1. Match the following (5 marks)

2. Explain the role of the Digestive system, and list 3 organs found in it (4 marks)

3. Draw the pyramid of organisation and give 2 examples at each level (11 marks)

4. Define what a tissue is and give an example from a plant(2 mark)

5. What is meant by ‘specialised’ cell (1 mark)

• Cells
• Tissues
• Organ
• Organ system
• Organisms

• A group of organs working together
• Group of tissues working together
• A group of similar cells working together
• A group of organ systems working together
• Building blocks of life