These are all types of cells found in the epidermis, EXCEPT
fibroblast
stem cells
melanocytes
dendritic cells
keratinocytes
The Correct Answer is A
A. fibroblast: Fibroblasts are connective tissue cells found in the dermis, responsible for producing collagen and extracellular matrix. They are not located in the epidermis.
B. stem cells: Epidermal stem cells are located in the stratum basale and are responsible for continuously producing new keratinocytes to replace shed cells.
C. melanocytes: Melanocytes are pigment-producing cells found in the stratum basale of the epidermis, providing melanin to protect against UV damage.
D. dendritic cells: Dendritic cells, also called Langerhans cells, are immune cells in the epidermis that detect pathogens and participate in immune responses.
E. keratinocytes: Keratinocytes are the predominant cell type in the epidermis, producing keratin and forming the protective outer layer of the skin.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Fibrocartilage; hyaline cartilage:Fibrocartilage is found in intervertebral discs, providing strong support and resistance to compression due to its dense collagen fibers. Hyaline cartilage forms the costal cartilage between ribs and the sternum, offering flexibility and smooth surfaces for joint movement.
B. Dense regular CT; fibrocartilage:Dense regular connective tissue is found in tendons and ligaments, not in intervertebral discs. Fibrocartilage, while present in discs, is not the main component of costal cartilage.
C. Hyaline cartilage; fibrocartilage:Hyaline cartilage provides structural support and smooth surfaces, but it is not the primary tissue of intervertebral discs. Fibrocartilage is not the main tissue of costal cartilage.
D. Fibrocartilage; dense regular CT:Dense regular connective tissue does not make up costal cartilage; it is primarily in tendons and ligaments. Fibrocartilage correctly describes intervertebral discs.
E. Elastic cartilage; hyaline cartilage:Elastic cartilage is found in structures requiring flexibility, such as the ear and epiglottis, not intervertebral discs. Hyaline cartilage correctly describes costal cartilage, but the first part is inaccurate.
Correct Answer is B
Explanation
A. metaphase plate:The metaphase plate is the imaginary plane in the middle of the cell where chromosomes align during metaphase. It does not involve actin filaments or the separation of daughter cells.
B. cleavage furrow:The cleavage furrow is formed by a contractile ring of actin filaments that tightens to constrict the cell membrane. This process physically separates the cytoplasm, resulting in two distinct daughter cells during cytokinesis.
C. mitotic spindle:The mitotic spindle is composed of microtubules that attach to chromosomes and move them during mitosis. It functions in chromosome segregation, not in the physical pinching of the cytoplasm.
D. centrosome:The centrosome is the microtubule-organizing center that helps form the mitotic spindle. While crucial in mitosis, it does not participate in the contraction needed for cell cleavage.
E. centromere:The centromere is the region where sister chromatids are attached and where spindle fibers connect during chromosome separation. It plays no role in the actin-driven division of the cytoplasm.
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