MNSR Integument: Skin Histology and Function

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What is the main function of the stratum basale layer?

To produce keratin

To provide a germinal layer for cell division (correct)

To allow skin shedding

To regulate skin pigmentation

What is the main component of the stratum corneum?

Columnar or cuboidal cells

Granules within the cells

Flattened fused cell remnants composed of keratin (correct)

Living cells with nuclei

What is the approximate duration of the entire epidermal cycle in humans?

30 days

21 days

27 days (correct)

14 days

What is the layer of the epidermis where cells start to lay down keratin?

Stratum spinosum Signup and view all the answers

What is the factor responsible for the inherent yellowish color of human skin?

Carotene in the subcutaneous fat Signup and view all the answers

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

Stratum lucidum Signup and view all the answers

What percentage of a normal person's mass is made up of skin?

12-16% Signup and view all the answers

What is the outermost layer of the skin composed of?

Stratified squamous epithelium Signup and view all the answers

What is the function of sebum, a secretion from the sebaceous glands?

To waterproof the skin Signup and view all the answers

What is the layer of skin below the dermis composed of?

Loose connective tissue Signup and view all the answers

What protein is present in the epidermis and gives rise to several structures such as hair, nails, hooves, and horns?

Keratin Signup and view all the answers

What is the process by which the epidermis undergoes change to form the surface layer (corneum)?

Keratinization Signup and view all the answers

What is one of the primary functions of the skin?

Protection against physical trauma Signup and view all the answers

What is the outermost layer of the skin responsible for?

Protection against UV light Signup and view all the answers

What is the role of hair in thermoregulation?

It provides insulation and plays a major role in temperature regulation Signup and view all the answers

What is the skin responsible for in terms of sensation?

Allowing interpretation of the external environment Signup and view all the answers

What is the role of melanin in the skin?

Protection against UV light Signup and view all the answers

What is the skin responsible for in terms of metabolism?

Producing vitamin D used in calcium and phosphate metabolism Signup and view all the answers