Front

What are white blood cells?

Back

They help fight body infection and other diseases.

Front

Which of these is part of the immune system?

Back

Lymph nodes.

Front

How does the immune system work?

Back

The immune system is like a series of sensors that detects an intruding pathogen, like bacteria or a virus.

Front

Does the immune system have real organs?

Back

True.

Front

Is the immune system a complex network of tissue and organs that spreads throughout the entire body?

Back

True.

Front

What is the primary function of the immune system?

Back

To protect the body from infections and diseases.

Front

What are pathogens?

Back

Microorganisms that can cause disease, such as bacteria, viruses, and fungi.

Front

What role do lymph nodes play in the immune system?

Back

They filter lymph fluid and help the body fight infections.

Front

What is an antigen?

Back

A substance that triggers an immune response, often found on the surface of pathogens.

Front

What are antibodies?

Back

Proteins produced by the immune system to neutralize or destroy antigens.