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Haematology and Anatomy (The Skin) Quiz on Epidermis, created by gina_evans0312 on 11/12/2013.

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Epidermis

Epidermis

Question 1 of 26

1

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

Select one of the following:

  • B-D-C-A

  • A-B-C-D

  • D-B-A-C

Explanation

Question 2 of 26

1

Which of the following stratum basale cells are associated with sensory nerves?

Select one of the following:

  • Merkel cell

  • Melanocyte

  • Basal cell

Explanation

Question 3 of 26

1

How much of the stratum basale is made of melanocytes?

Select one of the following:

  • 8-10%

  • 12-16%

  • 20-23%

Explanation

Question 4 of 26

1

Which of the following has dentritic projections?

Select one of the following:

  • Basal cells

  • Melanocytes

  • Merkel cells

Explanation

Question 5 of 26

1

What are produced by melanocytes?

Select one of the following:

  • Melanin

  • Melanosomes

  • Melanodesmosomes

Explanation

Question 6 of 26

1

Which of the following cells are actively dividing?

Select one of the following:

  • Basale

  • Melanocytes

  • Langerhans

Explanation

Question 7 of 26

1

What happens to melanocytes to cause sunburn?

Select one of the following:

  • High UV causes melanosome overproduction

  • High UV causes melanocyte apoptosis

Explanation

Question 8 of 26

1

How do melanosomes work?

Select one of the following:

  • 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

Explanation

Question 9 of 26

1

Which receptor activates under UV, increasing melanosome production?

Select one of the following:

  • MCR1

  • MC2

  • MCR3

Explanation

Question 10 of 26

1

What enzyme converts tyrosine to dopaquinone?

Select one of the following:

  • Tyrosinase

  • Dopaquinone synthase

Explanation

Question 11 of 26

1

Which of the following are used in determining skin colour?

Select one or more of the following:

  • Red phaemelanin

  • Black eumelanin

  • Brown pheumelanin

  • Pink leumelanin

Explanation

Question 12 of 26

1

How many layers of cells are in the stratum spinosum?

Select one of the following:

  • 8-10

  • 4-6

  • 6-8

Explanation

Question 13 of 26

1

How are cells in the stratum spinosum held together?

Select one of the following:

  • Desmosomes

  • Collagen

  • Myosin fibres

Explanation

Question 14 of 26

1

What is different about stratum spinosum cells compared to stratum spinosum cells?

Select one or more of the following:

  • The cytosol has shrunk somewhat

  • The keratin is coarser

  • The nucleus has begun to disintegrate

  • The cytosol has swelled

Explanation

Question 15 of 26

1

What is the role of langerhans cells?

Select one of the following:

  • Antigen presenting cells

  • Phagocytic cells

  • Sensory cells

Explanation

Question 16 of 26

1

Where are Langerhans cells found in the epidermis?

Select one of the following:

  • Stratum spinosum

  • Stratum basalum

  • Stratum granulosum

Explanation

Question 17 of 26

1

Where is the 'lipid glue' that holds the stratum corneum produced?

Select one of the following:

  • Stratum spinosum

  • Stratum granulosum

Explanation

Question 18 of 26

1

How many layers are present in the stratum granulosum?

Select one of the following:

  • 3-5

  • 12-15

  • 23-24

Explanation

Question 19 of 26

1

Why does the nucleus begin to disintegrate in the stratum granulosum?

Select one or more of the following:

  • They're undergoing apoptosis

  • The cells are too far from the nutrient source to sustain it

Explanation

Question 20 of 26

1

What protein organises the laying down of keratin fibres?

Select one of the following:

  • Keratohyalin

  • Keratosynthase

  • Keratoconstructase

Explanation

Question 21 of 26

1

Why is the stratum corneum made of keratinocytes?

Select one or more of the following:

  • They're waterproof

  • They provide UV protection

  • They can be lost easily

Explanation

Question 22 of 26

1

How long does it take a cell to reach the stratum corneum?

Select one of the following:

  • 12

  • 14

  • 16

Explanation

Question 23 of 26

1

What is psoriasis?

Select one or more of the following:

  • When cell turnover is too rapid (5-10 days)

  • When cell turnover is too slow (20-30 days)

  • Forms thick callouses

Explanation

Question 24 of 26

1

How many layers make up the stratum corneum?

Select one of the following:

  • 20-35 layer

  • 35-40

  • 40-45

Explanation

Question 25 of 26

1

What distinguishes stratum corneum cells?

Select one or more of the following:

  • No nucleus

  • Held together by desmosomes

  • Keratin only

  • Shed within 3 days

Explanation

Question 26 of 26

1

How thick is the stratum lucidum?

Select one of the following:

  • 1-3 layers

  • 2-4 layers

  • 4-6 layers

Explanation

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