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