Immunity Flashcards

1
Q

external defence against disease

A

skin - epidermis

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2
Q

internal defence against disease (3)

A

blood clotting
stomach acid
epithelial in airway barrier

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3
Q

types of leucocytes

A

lymphocytes/phagocytes

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4
Q

purpose of lymphocytes

A

immune response by releasing antibodies

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5
Q

purpose of phagocytes

A

mark for lymphocytes or engulf

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6
Q

how does the body distinguish between non-self and self

A

own cells have cell surface antigens that are detected as foreign in someone else’s body but normal in your own

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7
Q

when are antibodies produced

A

when lymphocytes meet foreign antigen

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8
Q

where are white blood cells made

A

bone marrow

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9
Q

types of phagocytes

A

neutrophils/macrophages

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10
Q

purpose of phagocytes

A

remove dead cells and breakdown of pathogen/bacteria

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11
Q

process of phagocytes (6)

A
  1. chemotaxis - histamine released to attract pathogen to site
  2. binding by complementary shape to antibody
  3. bacteria marked by antibody
  4. endocytosis
  5. lysosome/phagocyte vacuole breakdown
  6. digestion by proteases + enzymes
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12
Q

where are neutrophils found

A

blood

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13
Q

how many of leucocytes are neutrophils

A

60%

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14
Q

describe neutrophils

A

squeezes through capillaries
short lived and die
released in large numbers

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15
Q

where are macrophages found

A

organs

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16
Q

describe macrophages (4)

A

monocytes in blood that mature into macrophages in organs
larger than neutrophils
(lungs/kidney/lymph nodes)

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17
Q

describe lymphocytes

A

smaller than phagocytes

large nucleus

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18
Q

describe B cells

A

release antibodies and made in bone marrow where its spread through body
one mature B cells = one antigen

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19
Q

describe activated B cells

A
plasma cells (short time)
memory cells (long time)
20
Q

how are B/T cells matured (3)

A
  • B cells divide by mitosis to form clones
  • antibody receptors produced
  • mature B cells circulate in liver
21
Q

how do B cells work (4)

A

primary response: one B cell antibody spots antigen
mitosis
plasma cells secrete antibodies
secondary response: memory cells divide to form more plasma cells

22
Q

describe T cells

A

differentiate into memory cells

mature in thymus

23
Q

describe helper T cells

A

release cytokines to stimulate
B cells - plasma cells/secrete antibodies
phagocytosis

24
Q

describe killer T cells (2)

A
  • search for cells with pathogen on cell surface membrane

- recognise antigens and attach to surface and secrete hydrogen peroxide (kills cells/pathogens)

25
where are antibodies found during an immune response
surface of pathogens NOT on memory cells
26
how do vaccines work (8)
``` active immunity; vaccine contains pathogen; immune response; B cells secrete antibodies; T helper cells; clonal selection; memory cells remain; faster secondary response; ```
27
describe antibodies (4)
- globular + glycoprotein - specific - hinge for flexibility - antigen bind to variable region
28
describe the structure of antibodies
heavy chain on the bottom and light chain on the top with disulphide bonds between chains
29
describe artificial active
vaccination
30
describe artificial passive
direct injection of antibodies
31
describe natural active
your own body makes antibodies to infection
32
describe natural passive
breast milk passing antibodies
33
problems with vaccines (5)
- poor response - live virus - antigenic variation - antigen concealment - more than one strain
34
why was small pox able to be eradicted? (5)
- didn't mutate/change surface antigen - infected people were easy to identify - didn't affect animals - cheap to produce vaccines - same vaccine used
35
describe autoimmune diseases
immune system attacks one or more self antigens
36
how do autoimmune diseases come along (3)
maturation of T cells in thymus gland many cells destroyed - they are complementary to self antigens some don't and activate immune system to protein destruction
37
describe myastenia gravis
affects neuromuscular junctions | antibody blocks acetylcholine receptor blocking the motor neurones
38
symptom of myastenia gravis
muscle weakness
39
where does multiple sclerosis affect
central nervous system
40
symptom of multiple sclerosis
progressive paralysis
41
where does rheumatoid arthritis affect
joint
42
symptom of rheumatoid arthritis
progressive destruction of joints
43
where does type 1 diabetes affect
endocrine tissue in pancreas
44
symptom of type 1 diabetes
destruction of cells that secrete insulin
45
where does systemic lupus erthromotasus affect
skin, kidneys and joints
46
symptom of systemic lupus erthromotasus
progress deformity