351089
Beschreibung
Quiz von gina_evans0312, aktualisiert more than 1 year ago
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Erstellt von gina_evans0312
vor etwa 11 Jahre
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Frage 1
Frage
Put the layers of the epidermis in order
A- Stratum Corneus
B- Stratum Basalum
C- Stratum Granulosum
D- Straturm Spinosum
Antworten
-
B-D-C-A
-
A-B-C-D
-
D-B-A-C
Frage 2
Frage
Which of the following stratum basale cells are associated with sensory nerves?
Antworten
-
Merkel cell
-
Melanocyte
-
Basal cell
Frage 3
Frage
How much of the stratum basale is made of melanocytes?
Antworten
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8-10%
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12-16%
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20-23%
Frage 4
Frage
Which of the following has dentritic projections?
Antworten
-
Basal cells
-
Melanocytes
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Merkel cells
Frage 5
Frage
What are produced by melanocytes?
Antworten
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Melanin
-
Melanosomes
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Melanodesmosomes
Frage 6
Frage
Which of the following cells are actively dividing?
Antworten
-
Basale
-
Melanocytes
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Langerhans
Frage 7
Frage
What happens to melanocytes to cause sunburn?
Antworten
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High UV causes melanosome overproduction
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High UV causes melanocyte apoptosis
Frage 8
Frage
How do melanosomes work?
Antworten
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When exposed to UV, they form a 'cap' over the nucleus
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When exposed to UV, the burst, spreading melanin throughout the cell
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When exposed to UV, they destroy UV damaged proteins
Frage 9
Frage
Which receptor activates under UV, increasing melanosome production?
Antworten
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MCR1
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MC2
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MCR3
Frage 10
Frage
What enzyme converts tyrosine to dopaquinone?
Antworten
-
Tyrosinase
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Dopaquinone synthase
Frage 11
Frage
Which of the following are used in determining skin colour?
Antworten
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Red phaemelanin
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Black eumelanin
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Brown pheumelanin
-
Pink leumelanin
Frage 12
Frage
How many layers of cells are in the stratum spinosum?
Antworten
-
8-10
-
4-6
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6-8
Frage 13
Frage
How are cells in the stratum spinosum held together?
Antworten
-
Desmosomes
-
Collagen
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Myosin fibres
Frage 14
Frage
What is different about stratum spinosum cells compared to stratum spinosum cells?
Antworten
-
The cytosol has shrunk somewhat
-
The keratin is coarser
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The nucleus has begun to disintegrate
-
The cytosol has swelled
Frage 15
Frage
What is the role of langerhans cells?
Antworten
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Antigen presenting cells
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Phagocytic cells
-
Sensory cells
Frage 16
Frage
Where are Langerhans cells found in the epidermis?
Antworten
-
Stratum spinosum
-
Stratum basalum
-
Stratum granulosum
Frage 17
Frage
Where is the 'lipid glue' that holds the stratum corneum produced?
Antworten
-
Stratum spinosum
-
Stratum granulosum
Frage 18
Frage
How many layers are present in the stratum granulosum?
Antworten
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3-5
-
12-15
-
23-24
Frage 19
Frage
Why does the nucleus begin to disintegrate in the stratum granulosum?
Antworten
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They're undergoing apoptosis
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The cells are too far from the nutrient source to sustain it
Frage 20
Frage
What protein organises the laying down of keratin fibres?
Antworten
-
Keratohyalin
-
Keratosynthase
-
Keratoconstructase
Frage 21
Frage
Why is the stratum corneum made of keratinocytes?
Antworten
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They're waterproof
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They provide UV protection
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They can be lost easily
Frage 22
Frage
How long does it take a cell to reach the stratum corneum?
Antworten
-
12
-
14
-
16
Frage 23
Frage
What is psoriasis?
Antworten
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When cell turnover is too rapid (5-10 days)
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When cell turnover is too slow (20-30 days)
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Forms thick callouses
Frage 24
Frage
How many layers make up the stratum corneum?
Antworten
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20-35 layer
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35-40
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40-45
Frage 25
Frage
What distinguishes stratum corneum cells?
Antworten
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No nucleus
-
Held together by desmosomes
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Keratin only
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Shed within 3 days
Frage 26
Frage
How thick is the stratum lucidum?
Antworten
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1-3 layers
-
2-4 layers
-
4-6 layers
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