Biology-B3-Non-specific Defence Systems 0.0 / 5 ? BiologyMicrobes and diseaseGCSEAQA Created by: tonisha_Created on: 09-06-21 19:26 What is the job of the non-specific defence system? to prevent pathogens from entering human body 1 of 30 What are the 2 types of barriers? mechanical and chemical 2 of 30 What is the skin? (barrier) mechanical barrier 3 of 30 What does it do? form a protective layer, covering the body 4 of 30 What type of cells does the outer layer of skin consist of? dead cells 5 of 30 What does this cause for the pathogens? difficult for pathogens to penetrate 6 of 30 What is the oily substance called produced by the skin? sebum 7 of 30 What can sebum do? kill bacteria 8 of 30 What will happen if the skin is damaged? it will heal itself by forming a scab 9 of 30 How is the scab formed? platelets 10 of 30 What type of barrier are eyes? chemical barrier 11 of 30 What do they produce? tears containing enzymes 12 of 30 What type of enzyme ? lysosomes 13 of 30 What does the do? prevent infection 14 of 30 What does the nose contain? hairs and mucus 15 of 30 What type of barrier is mucus? chemical barrier 16 of 30 What type of barriers are hairs? mechanical barriers 17 of 30 What do the hairs do? trap pathogens before they enter breathing system 18 of 30 What does the mucus do? traps pathogens 19 of 30 How are the pathogens removed? when the nose is blown 20 of 30 What are the cells called that line the trachea? ciliated cells 21 of 30 What are ciliated cells? cells with cilia(little hairs smaller than nose hairs) 22 of 30 What are they covered in ? mucus 23 of 30 How are the pathogens removed? the cilia waft mucus towards throat into the stomach 24 of 30 Which cells are is the mucus produced in? goblet cells 25 of 30 What type of barrier is stomach acid? chemical barrier 26 of 30 What is stomach acid also known as? hydrochloric acid 27 of 30 What does this acid do? kill pathogens before they travel further down digestive system. 28 of 30 What are non-specific defence systems also known as? the body's first line of defence 29 of 30 What happens if the pathogen manages to pass the first line of defence? the second line of defence is activated: the immune system 30 of 30
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