SB5i Physical and chemical barriers Flashcards

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1
Q

What do physical barriers do?

A

make it difficult for pathogens to enter the body.

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2
Q

What do chemical barriers do?

A

destroy or inactivate pathogens on the outside or inside the body.

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3
Q

Physical barriers and how they work (3) humans

A

.Skin (pathogens struggle to get through the layers of skin and enter our body)​

.Ciliated cells (move mucus and the trapped pathogens away from the lungs, either out of the mouth or into the digestive system)​

.Mucus (sticky substance that traps pathogens and dust entering the body)

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4
Q

Chemical barriers and how they work (2)

A

.Lysozymes (secreted by glands, in tears, in mucus and in saliva, killing bacteria by breaking down their cell walls)​

.Hydrochloric acid (kills the majority of pathogens that enter our body on food as the acid makes our stomach have a pH of 2)

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5
Q

What are STIs?

A

sexually transmitted infections that overcome natural barries in the human reproductive system

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6
Q

How are STIs spread?

A

.by contact with sexual fluids
.can also be passed between a pregnant mother and her baby

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7
Q

How can STIs be prevented?

A

.screening i used to identify people with STIs so they can be treated

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