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Unit 21 Assignment 2 (P3, M2, D2)
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- PEARSON (PEARSON)
Unit 21 Assignment 2 - Biomedical Science Techniques Pearson BTEC Level 3 Applied Science Extended Diploma
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Ava ParkerUnit 21 Assignment 2
(P3)
Immunity is the ability of our bodies to resist an infection and to remove that foreign
material quickly and effectively. Infection means that you have a higher risk of getting
an infection as the three lines of defence have failed. The body defends itself against
infections by using two defence mechanisms. One of the two defence mechanisms is
non-specific or innate immunity and the other is called specific or adaptive or acquired
immunity. Specific immunity is the immune response against a specific pathogen and
non-specific immunity is the immediate protective response of the immune system
which doesn’t require previous exposure to the pathogen (Pediaa.Com, 2019).
(Slideshare.net, 2019)
1st line of defence:
The 1st line of defence is the epithelial barrier and it is non - specific. The barriers are
our skin, mucous membrane, tears and commensals. Our skin is almost an unpassable
barrier to microbes getting in and chemical weapons on our skin strengthens this
defence. The chemical weapons are oil and sweat glands, which make our skin the pH of
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