First+Line+of+Defence

=Unit 1 Cells and Systems=

Chapter 3 The immune system protects the human body.
3.1 The Immune System


 * 3.1 First Line of Defence** page 102
 * **Questions** || **Answers** ||
 * Pathogens rarely attacks our body. True or False? ||  ||
 * What is the first line of defence against infectious diseases? ||  ||
 * What does the sweat and oil on your skin prevent? ||  ||
 * Can pathogens grow on the surface of your skin? ||  ||
 * What are the other defences inside your body? ||  ||
 * What can gastric juice destroy? ||  ||
 * Name the things that line your nose and prevent pathogens from entering your respiratory system. ||  ||
 * What are the other defences inside your body? ||  ||
 * What can gastric juice destroy? ||  ||
 * Name the things that line your nose and prevent pathogens from entering your respiratory system. ||  ||
 * What can gastric juice destroy? ||  ||
 * Name the things that line your nose and prevent pathogens from entering your respiratory system. ||  ||
 * Name the things that line your nose and prevent pathogens from entering your respiratory system. ||  ||

The First Line Of Defence

The immune system defends people against germs and pathogens every day. In most cases, the immune system does a great job of keeping people healthy and preventing infections. But sometimes problems with the immune system can lead to illness.

The immune system is the body's defense against infectious organisms and other invaders. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade our systems and cause disease. The immune system is made up of a network of cells, tissues, and organs that work together to protect the body.