From Cells to Organ Systems

Place these levels of organisation in order from smallest to largest: organ system, cell, tissue, organ, organism.

Define specialised cell and give one example.

What is a tissue?

Explain how an organ is different from a tissue.

Name one organ system and state its main function.

How do red blood cells help the circulatory system do its job?

Why do multicellular organisms need different types of cells?

Give one example of structure matching function in a human organ.

Explain why a stomach is an organ, not a tissue.

Write one sentence linking a cell, tissue, organ and organ system.

Explain how cells, tissues, organs and organ systems are related. Use one named body system as your example.

Choose one specialised cell and explain how at least three structural features help it perform its function.

Describe how the digestive system uses different organs to break down food and absorb nutrients.

Compare the role of muscle tissue and nervous tissue in helping an organism respond to its environment.

A student says, “An organ system is just a group of identical cells.” Explain why this is incorrect.

Use the respiratory system to explain how structure and function are connected at the organ level.

Explain what might happen to an organism if one organ in a system stops working properly.

Create a flow chart showing how oxygen moves from the air to body cells. Include organs and tissues involved.

Explain why studying body systems requires looking at both small-scale structures and whole-organism functions.

Write a paragraph explaining how division of labour makes multicellular organisms more efficient.