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Which of the following layers of epidermis contains the rapidly dividing keratinocytes?

A.

Stratum granulosum

B.

Stratum basale

C.

Stratum lucidum

D.

Stratum spinosum

Answer and Explanation

The Correct Answer is B

a. Stratum granulosum: This layer is composed of keratinocytes that are in the process of dying and forming a barrier of keratin.

b. Stratum basale: This is the deepest layer of the epidermis, where keratinocytes are actively dividing. This layer contains stem cells that produce new keratinocytes to replace those shed from the surface.

c. Stratum lucidum: This layer is only present in thick skin, such as on the palms and soles, and consists of dead keratinocytes that have a translucent appearance.

d. Stratum spinosum: This layer contains keratinocytes that are beginning to produce keratin and other proteins but are not rapidly dividing.


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Related Questions

Correct Answer is C

Explanation

a. Kidneys: Kidney dysfunction can affect waste elimination and fluid balance but does not typically cause yellow sclera.

b. Appendix: The appendix is involved in the immune response and gut flora regulation but not in causing yellow sclera.

c. Liver: Liver dysfunction can lead to jaundice, where bilirubin accumulates in the blood and tissues, causing yellowing of the skin and sclera.

d. Spleen: The spleen is involved in blood filtration and immune response but does not directly cause yellow sclera

Correct Answer is C

Explanation

a. Ovary: The ovary releases the ovum during ovulation, but fertilization does not occur here.

b. Uterus: The fertilized ovum implants and develops in the uterus, but fertilization occurs earlier.

c. Fallopian tube: Fertilization typically occurs in the ampulla of the fallopian tube, where the sperm meets the ovum.

d. Cervix: The cervix is the lower part of the uterus and is not involved in the fertilization process.

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