Explain how does the body react after the entry of microbes in the body.

Our body has several natural defences such as skin, white blood cells and mucous to ward off infections.

• Tears wash away germs from the eyes.
• Mucous lining in the nasal cavity traps germs to purify inhaled air.
• Leucocytes (WBCs) in blood attack invading germs.
• Strong acid in stomach kill many germs in food.
• Skin acts as a barrier and keeps out most germs.

Besides these natural defences, the body has a special system of defence known as the immune system. When a microbe enters a person's body, specific antibodies are produced in the blood to fight it. These antibodies provide natural resistance to the body against that particular microbe.