351089
Descripción
Test por gina_evans0312, actualizado hace más de 1 año
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Creado por gina_evans0312
hace más de 10 años
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Pregunta 1
Pregunta
Put the layers of the epidermis in order
A- Stratum Corneus
B- Stratum Basalum
C- Stratum Granulosum
D- Straturm Spinosum
Respuesta
-
B-D-C-A
-
A-B-C-D
-
D-B-A-C
Pregunta 2
Pregunta
Which of the following stratum basale cells are associated with sensory nerves?
Respuesta
-
Merkel cell
-
Melanocyte
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Basal cell
Pregunta 3
Pregunta
How much of the stratum basale is made of melanocytes?
Respuesta
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8-10%
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12-16%
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20-23%
Pregunta 4
Pregunta
Which of the following has dentritic projections?
Respuesta
-
Basal cells
-
Melanocytes
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Merkel cells
Pregunta 5
Pregunta
What are produced by melanocytes?
Respuesta
-
Melanin
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Melanosomes
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Melanodesmosomes
Pregunta 6
Pregunta
Which of the following cells are actively dividing?
Respuesta
-
Basale
-
Melanocytes
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Langerhans
Pregunta 7
Pregunta
What happens to melanocytes to cause sunburn?
Respuesta
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High UV causes melanosome overproduction
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High UV causes melanocyte apoptosis
Pregunta 8
Pregunta
How do melanosomes work?
Respuesta
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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
Pregunta 9
Pregunta
Which receptor activates under UV, increasing melanosome production?
Respuesta
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MCR1
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MC2
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MCR3
Pregunta 10
Pregunta
What enzyme converts tyrosine to dopaquinone?
Respuesta
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Tyrosinase
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Dopaquinone synthase
Pregunta 11
Pregunta
Which of the following are used in determining skin colour?
Respuesta
-
Red phaemelanin
-
Black eumelanin
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Brown pheumelanin
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Pink leumelanin
Pregunta 12
Pregunta
How many layers of cells are in the stratum spinosum?
Respuesta
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8-10
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4-6
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6-8
Pregunta 13
Pregunta
How are cells in the stratum spinosum held together?
Respuesta
-
Desmosomes
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Collagen
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Myosin fibres
Pregunta 14
Pregunta
What is different about stratum spinosum cells compared to stratum spinosum cells?
Respuesta
-
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
Pregunta 15
Pregunta
What is the role of langerhans cells?
Respuesta
-
Antigen presenting cells
-
Phagocytic cells
-
Sensory cells
Pregunta 16
Pregunta
Where are Langerhans cells found in the epidermis?
Respuesta
-
Stratum spinosum
-
Stratum basalum
-
Stratum granulosum
Pregunta 17
Pregunta
Where is the 'lipid glue' that holds the stratum corneum produced?
Respuesta
-
Stratum spinosum
-
Stratum granulosum
Pregunta 18
Pregunta
How many layers are present in the stratum granulosum?
Respuesta
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3-5
-
12-15
-
23-24
Pregunta 19
Pregunta
Why does the nucleus begin to disintegrate in the stratum granulosum?
Respuesta
-
They're undergoing apoptosis
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The cells are too far from the nutrient source to sustain it
Pregunta 20
Pregunta
What protein organises the laying down of keratin fibres?
Respuesta
-
Keratohyalin
-
Keratosynthase
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Keratoconstructase
Pregunta 21
Pregunta
Why is the stratum corneum made of keratinocytes?
Respuesta
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They're waterproof
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They provide UV protection
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They can be lost easily
Pregunta 22
Pregunta
How long does it take a cell to reach the stratum corneum?
Respuesta
-
12
-
14
-
16
Pregunta 23
Pregunta
What is psoriasis?
Respuesta
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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
Pregunta 24
Pregunta
How many layers make up the stratum corneum?
Respuesta
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20-35 layer
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35-40
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40-45
Pregunta 25
Pregunta
What distinguishes stratum corneum cells?
Respuesta
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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
Pregunta 26
Pregunta
How thick is the stratum lucidum?
Respuesta
-
1-3 layers
-
2-4 layers
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4-6 layers
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