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biology 0610printed 138 · PDF 138
328 pagesrevision 46933
printed 138 · PDF 138
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Aitchison College Academic Resources.
(c) State two other substances, apart from antibodies, transported by the blood.
NN SUB CG i ssssississitashisiceiseai ciao
sssssussosnnasnnnngnunnnnnaninaninnuunsnnsunnnnnannnigenunaninnesinensnanneoasusunnnnsninaneannaenee o
(Total 5 marks)
(a) Explain how the skin and mucous membranes prevent entry of pathogens into the body.
-Skin.acts.as. physical. barrier..Skin.has........
several. layers.of.cells.. The skin.is.dry.and
discourages growth of pathogens. Enzyme
lysozyme present on skin which breaks
down pathogens
ee ee Oe 7
(b) Explain why antibiotics are used to treat bacterial but not viral diseases.
Antibiotics inhibit cell wall. growth. Viruses don't...
possess cell walls and are unaffected
sscsuusosanasnnnnnnannnnnnsnannnnannnnnnnueninnavnnsigsnunasnnerinenunanasinuvnenassnneeenanenenen »
(Total 5 marks)
138