3-L2 Skin
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Questions and Answers

What is the characteristic appearance of a psoriasis patch?

  • Circumscribed red patch with white scales (correct)
  • Small, itchy, flat patches on the skin
  • Blistering lesions with a yellow crust
  • Open sores with a foul odor

What is the main cause of psoriasis?

  • Abnormal immune system response
  • Allergic reaction to a skin care product
  • Bacterial infection of the skin
  • Increase in the number of proliferating cells (correct)

What is the result of the increased cell proliferation in psoriasis?

  • Greater epidermal thickness and more rapid renewal of epidermis (correct)
  • Reduced skin sensitivity and numbness
  • Slower skin renewal and thinner epidermis
  • Increased skin elasticity and firmness

What is the characteristic of pemphigus, a type of blistering disorder?

<p>Autoimmune damage to skin cells (B)</p> Signup and view all the answers

What is affected in pemphigus, leading to blistering?

<p>Intercellular junctions between keratinocytes (C)</p> Signup and view all the answers

What is the relationship between keratinocytes in pemphigus?

<p>They are damaged, disrupting intercellular junctions (D)</p> Signup and view all the answers

What is the name of the layer of the epidermis where cells are constantly mitotically active?

<p>Stratum basale (D)</p> Signup and view all the answers

What type of cells are found in the Stratum basale?

<p>Keratinocytes, melanocytes, and merkel's cells (D)</p> Signup and view all the answers

What is the function of Keratohyalin granules in the Stratum granulosum?

<p>To associate with keratin filaments (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of Stratum spinosum?

<p>It is the thickest layer of the epidermis (C)</p> Signup and view all the answers

What is the name of the layer that is only present in thick skin?

<p>Stratum lucidum (C)</p> Signup and view all the answers

What is the approximate time it takes for the cells in the Stratum basale to turnover?

<p>15-30 days (C)</p> Signup and view all the answers

What is the location of the stratum lucidum in the skin?

<p>Superficial to the stratum granulosum (D)</p> Signup and view all the answers

What is unique about the cells in the stratum lucidum?

<p>They are densely packed with keratin filaments parallel to the skin surface (C)</p> Signup and view all the answers

What is the function of the extracellular lipids in the stratum corneum?

<p>To form a water barrier (B)</p> Signup and view all the answers

Which layer of the epidermis varies most in thickness?

<p>Stratum corneum (D)</p> Signup and view all the answers

What is the characteristic of the cells in the stratum corneum?

<p>They are flat and filled with keratin (B)</p> Signup and view all the answers

What is the function of the keratin filaments in the stratum lucidum?

<p>To provide mechanical strength (B)</p> Signup and view all the answers

Where is tyrosinase synthesized?

<p>Rough endoplasmic reticulum (A)</p> Signup and view all the answers

What is the stage where melanin synthesis begins?

<p>Stage II melanosomes (A)</p> Signup and view all the answers

What is the result of melanocyte activity?

<p>Amount of melanin granules (A)</p> Signup and view all the answers

What is the function of stage III melanosomes?

<p>Melanin accumulation (C)</p> Signup and view all the answers

What is the final destination of melanin granules?

<p>Keratinocytes of the malpighian layer (B)</p> Signup and view all the answers

What varies in different regions of skin of an individual?

<p>Number of melanocytes/square mm (A)</p> Signup and view all the answers

What is the average surface area of the skin in adults?

<p>1-2 m^2 (D)</p> Signup and view all the answers

How much does the skin weigh in adults?

<p>3-5 kg (B)</p> Signup and view all the answers

What is the function of the skin as a physical barrier?

<p>To protect against thermal and mechanical insults (D)</p> Signup and view all the answers

What is the composition of the skin?

<p>Epidermis and dermis (A)</p> Signup and view all the answers

What is the purpose of the skin's sensory function?

<p>To constantly monitor the environment (C)</p> Signup and view all the answers

What is the thickness of the epidermis in thin skin?

<p>75-150 micrometers (A)</p> Signup and view all the answers

What is the function of the skin related to calcium metabolism?

<p>To synthesize vitamin D3 (B)</p> Signup and view all the answers

What is the relationship between the dermis and epidermis?

<p>The junction of dermis and epidermis is irregular (A)</p> Signup and view all the answers

What is the location of the subcutaneous tissue?

<p>Below the dermis (B)</p> Signup and view all the answers

What is the thickness of the epidermis in thick skin?

<p>400-1400 micrometers (A)</p> Signup and view all the answers

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