Question

The pigment melanin protects the skin from
(A) Uv rays
(B) Visible rays
(C) Infrared rays
(D) X-rays

Answer 1

Melanin is produced in specialized cells called melanocytes that are generally distributed in the epidermal-dermal junction and then distributed to surrounding keratinocytes, which are the most plentiful cells in the epidermis.

Step by step answer: Option (A) Uv rays
In the skin, melanogenesis occurs after exposure to UV radiation, resulting in the skin to visibly tan. Melanin is an effective absorber of light the pigment can disperse over 99.9% of absorbed UV radiation. Because of this property, melanin is supposed to protect skin cells from UVB radiation damage, reducing the risk of cancer.
Option (B) Visible rays
The visible light radiation can exercise various biologic consequences such as erythema, pigmentation, thermal damage, and free radical production. Additionally, visible light exposure can cause or deepen photodermatoses such as solar urticaria. Visible light doesn’t come across to cause much direct DNA destruction.
Option (C) Infrared ray
Human melanocytes were exposed to physiologic doses of IR and UV rays. Compared to cells irradiated with UV rays only, simultaneous susceptibility to IR significantly reduced the apoptotic rate. However, IR did not affect the repair of UVR-induced DNA damage. As in outcome, infrared rays intensify the survival of melanocytes holding up UVR-induced DNA damage and thereby might contribute to causing melanomagenesis.
Option (D) X-rays
X-rays are also called as electromagnetic waves. X-ray reflecting creates images of the inside of your body. The images show the parts of your body in different hues of black and white. This is because different tissues immerse different amounts of radiation. Calcium in bones absorbs most of the X-rays so bones appear white. Fat and other soft tissues consume lighter less and appear gray. Air absorbs the
least, so lungs appear black.
Thus the correct answer is Option (A) UV rays.

Note: Ultraviolet radiation (UVR) is the important environmental factor that affects the function and survival of many cell types and is regarded as the main causative aspect in the induction of epithelial
tumors like basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and malignant melanoma.