1. The main purpose of a melanocyte in the epithelial layers of the skin is to a
ID: 3510716 • Letter: 1
Question
1. The main purpose of a melanocyte in the epithelial layers of the skin is to
a. Waterproof the skin
b. Relaying sensory information
c. Trap foreign particles
d. Prevent DNA damage
2. The main purpose of a Langerhan's cell in the epithelial layers of the skin is to
a. Waterproof the skin
b. Relaying sensory information
c. Trap foreign particles
d. Prevent DNA damage
3. The purpose of a keratinocyte in the epithelial layers of the skin is to
a. Waterproof the skin
b. Relaying sensory information
c. Trap foreign particles
d. Prevent DNA damage
4. A 40 year old female presents in the office with light color splotches on her torso. Her medical history includes Hypothyroidism, diagnosed at 12 and Type Diabetes Mellitus, diagnosed at 18. Which disease is most likely associated with her symptoms?
a. Vitiligo
b. Xeroderma Pigmentosum
c. Cystic Fibrosis
d. Squamous Cell Carcinoma
e. Malignant Melanoma
5. A 35 year male fisherman, presents in the dermatology office for the first time. You observe several dark colored lesion on his shoulders and neck. They are asymmetrical with irregular borders and various colors. Which disease is most likely associated with his symptoms?
a. Vitiligo
b. Xeroderma Pigmentosum
c. Cystic Fibrosis
d. Squamous Cell Carcinoma
e. Malignant Melanoma
Explanation / Answer
1. Melanocytes produce melanin that protects the skin from UV light thereby preventing DNA damage. So, the correct option is option D, prevent DNA damage.
2. Langerhans cells are the residential macrophages of the epidermis that protect the skin from the invading pathogens. So, the correct option is option C, trap foreign particles.
3. Keratinocytes present in the skin produce keratin and lamellar granules. These lamellar granules in turn release water proofing substances. So, the correct option is option A, waterproof the skin.
4. Vitiligo is a disease in which white patches are formed on the skin. This occurs when melanocytes stop producing melanin. Vitiligo is linked to disorders like diabetes mellitus, Hashimoto's thyroiditis (hypothyroidism). So, the correct option is option A, vitiligo.
5. Malignant melanoma is characterized by skin lesions that are asymmetric in shape with irregular borders and varied colors. So, the correct option is option E, malignant melanoma.
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