Question

What is the immune system?

Options

• A network of blood vessels that circulate nutrients throughout the body

• The system responsible for breaking down food and absorbing nutrients

• A collection of organs that produce and store hormones

• The system of defence mechanisms that protects the body against harmful agents

Answer 1

The immune system is defined as the system of defence mechanisms that protects the body against harmful agents such as pathogens, toxins, and foreign substances. It is composed of lymphoid organs, tissues, cells, and soluble molecules that work together to defend the body.