PRIMARY DEFENCE - Human Defence Systems Flashcards
what are the 6 primary defence systems
Nose
Skin
stomach acid - HCl
Scabs
Sebum
Tears
what does the nose produce to protect us and HOW
mucus in the nostrils which increase Surface Area for pathogens to stick to and get blown out.
how does sebum function
found in the pores it has antibacterial properties and will stop growth of pathogens
what does the skin function as (P_____B_____)
a physical barrier because skin is keratinised meaning no alive cells are exposed to surface
similar to the skin what does a scab function as
physical barrier seals cuts quickly to prevent infection
what do tears contain
an enzyme which breaks down bacteria and viruses
what characteristic of stomach acid makes it a defence
acidic pH which destroys pathogens we consume
what is the main function of primary defence systems
stop pathogens entering the tissues of the body.
what cells combined with mucus are found in the trachea and bronchi
cilliated epithelial cells trap and move pathogens out of the respiratory tract.
