SC8 #5 Immune system Flashcards

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1
Q

What does the immune system do?

A

Fights and guards against pathogens, which are found everywhere and can infect people with a range of diseases

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2
Q

How can diseases be passed on tho other people?

A

Direct contact, indirect contact, infected food/drink and animal bites

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3
Q

What does the first line of defense do?

A
  1. skin stops pathogens from entering
  2. sweat and oil kill pathogens
  3. gastric juice destroys pathogens
  4. mucus in nose keeps pathogens out
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4
Q

What does the second line of defense do?

A

If a pathogen makes it past the first line of defense, the body mounts an immune response to destroy it.

Success depends on body’s ability.

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5
Q

What are the two types of immune response?

A

Innate and acquired

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6
Q

What is innate immune response?

A

All living things are born with it.
Fluid flows to the site of the infection (aka inflammation).
Increase in white blood cell phagocytes

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7
Q

What do phagocytes do?

A

Chemically digest pathogens

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8
Q

What is acquired immune response?

A

A very specific attack on an antigen.

May take up to a week to develop.

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9
Q

What is an antigen?

A

A non-living particle or substance, carried by phagocytes

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10
Q

What do B cells do?

A

Recognize antigens and produce antibodies to fight them

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11
Q

What are Memory B cells?

A

Specialized B cells that are stored in the body and get reactivated when the pathogens reappear

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12
Q

What do Helper T cells do?

A

Recognize antigens and activate B cells

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13
Q

What do Killer T cells do?

A

Directly destroy antigens or pathogens

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14
Q

What are vaccines and give a few examples

A

A weakened or dead form of a pathogen.

Ex: flu, tetanus, diphtheria, pertussis etc

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15
Q

What are allergies?

A

Hypersensitivity to allergens of the immune system

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16
Q

What is AIDS?

A

Caused by HIV and shuts down immune system

17
Q

What is a pathogen?

A

A living thing that causes disease

18
Q

What is the role of antibodies?

A
  1. Bind to antigens to make them harmless
  2. Mark antigens for later destruction
  3. Protect the body from future infections
19
Q

What do allergens do?

A

Causes allergic reactions

20
Q

What is histamine?

A

A chemical that the body releases when it fights invaders

21
Q

How does a vaccine work?

A

Stimulates your immune system to produce more antibodies

22
Q

Which cells does HIV attack?

A

Helper T cells