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Student Number: cm09xp9897, Course Title: Beauty Therapy, Assignment 2 The Immune system The immune system is a network of organs that contain cells which recognize foreign substances and destroys them. All living organisms are exposed to harmful substances and most can protect themselves in several ways, either with physical barriers or chemicals that repel and kill them. It protects vertebrates against viruses, bacteria, fungi and other parasites. These viruses are called pathogens. The immune system is known to help in the fight against cancer. A type of white cell, which is called the killer cells, is able to identify tumour cells simply by its change in its surface membrane. Other cells, called the helper cells, assist the killers to multiply and they then connect themselves to the cancerous cells to destroy them. There are two types of defence - the innate and the adaptive. The innate includes barriers like the skin and antibacterial enzymes...

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