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Epidermis

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Haematology and Anatomy (The Skin) Quiz on Epidermis, created by gina_evans0312 on 12/11/2013.
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Quiz by gina_evans0312, updated more than 1 year ago
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Created by gina_evans0312 about 11 years ago
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Resource summary

Question 1

Question
Put the layers of the epidermis in order A- Stratum Corneus B- Stratum Basalum C- Stratum Granulosum D- Straturm Spinosum
Answer
  • B-D-C-A
  • A-B-C-D
  • D-B-A-C

Question 2

Question
Which of the following stratum basale cells are associated with sensory nerves?
Answer
  • Merkel cell
  • Melanocyte
  • Basal cell

Question 3

Question
How much of the stratum basale is made of melanocytes?
Answer
  • 8-10%
  • 12-16%
  • 20-23%

Question 4

Question
Which of the following has dentritic projections?
Answer
  • Basal cells
  • Melanocytes
  • Merkel cells

Question 5

Question
What are produced by melanocytes?
Answer
  • Melanin
  • Melanosomes
  • Melanodesmosomes

Question 6

Question
Which of the following cells are actively dividing?
Answer
  • Basale
  • Melanocytes
  • Langerhans

Question 7

Question
What happens to melanocytes to cause sunburn?
Answer
  • High UV causes melanosome overproduction
  • High UV causes melanocyte apoptosis

Question 8

Question
How do melanosomes work?
Answer
  • When exposed to UV, they form a 'cap' over the nucleus
  • When exposed to UV, the burst, spreading melanin throughout the cell
  • When exposed to UV, they destroy UV damaged proteins

Question 9

Question
Which receptor activates under UV, increasing melanosome production?
Answer
  • MCR1
  • MC2
  • MCR3

Question 10

Question
What enzyme converts tyrosine to dopaquinone?
Answer
  • Tyrosinase
  • Dopaquinone synthase

Question 11

Question
Which of the following are used in determining skin colour?
Answer
  • Red phaemelanin
  • Black eumelanin
  • Brown pheumelanin
  • Pink leumelanin

Question 12

Question
How many layers of cells are in the stratum spinosum?
Answer
  • 8-10
  • 4-6
  • 6-8

Question 13

Question
How are cells in the stratum spinosum held together?
Answer
  • Desmosomes
  • Collagen
  • Myosin fibres

Question 14

Question
What is different about stratum spinosum cells compared to stratum spinosum cells?
Answer
  • The cytosol has shrunk somewhat
  • The keratin is coarser
  • The nucleus has begun to disintegrate
  • The cytosol has swelled

Question 15

Question
What is the role of langerhans cells?
Answer
  • Antigen presenting cells
  • Phagocytic cells
  • Sensory cells

Question 16

Question
Where are Langerhans cells found in the epidermis?
Answer
  • Stratum spinosum
  • Stratum basalum
  • Stratum granulosum

Question 17

Question
Where is the 'lipid glue' that holds the stratum corneum produced?
Answer
  • Stratum spinosum
  • Stratum granulosum

Question 18

Question
How many layers are present in the stratum granulosum?
Answer
  • 3-5
  • 12-15
  • 23-24

Question 19

Question
Why does the nucleus begin to disintegrate in the stratum granulosum?
Answer
  • They're undergoing apoptosis
  • The cells are too far from the nutrient source to sustain it

Question 20

Question
What protein organises the laying down of keratin fibres?
Answer
  • Keratohyalin
  • Keratosynthase
  • Keratoconstructase

Question 21

Question
Why is the stratum corneum made of keratinocytes?
Answer
  • They're waterproof
  • They provide UV protection
  • They can be lost easily

Question 22

Question
How long does it take a cell to reach the stratum corneum?
Answer
  • 12
  • 14
  • 16

Question 23

Question
What is psoriasis?
Answer
  • When cell turnover is too rapid (5-10 days)
  • When cell turnover is too slow (20-30 days)
  • Forms thick callouses

Question 24

Question
How many layers make up the stratum corneum?
Answer
  • 20-35 layer
  • 35-40
  • 40-45

Question 25

Question
What distinguishes stratum corneum cells?
Answer
  • No nucleus
  • Held together by desmosomes
  • Keratin only
  • Shed within 3 days

Question 26

Question
How thick is the stratum lucidum?
Answer
  • 1-3 layers
  • 2-4 layers
  • 4-6 layers
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