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 C
Explanation
A. acetyl CoA:Acetyl CoA is a critical intermediate in cellular respiration that enters the Krebs cycle. However, it is not the primary fuel source but rather a product derived from the breakdown of carbohydrates, fats, or proteins.
B. protein:Proteins can be used for energy when carbohydrates and fats are scarce, but they are primarily reserved for structural and functional roles such as enzyme production and tissue repair. Their breakdown for energy is less efficient and not the main source of fuel.
C. glucose:Glucose is the body’s preferred and most readily available fuel for cellular respiration. It undergoes glycolysis, the Krebs cycle, and oxidative phosphorylation to produce ATP efficiently, making it the main energy substrate under normal conditions.
D. fat:Fats provide a large energy reserve and yield more ATP per molecule than glucose, but they must undergo beta-oxidation before entering respiration pathways. They are slower to mobilize and not considered the immediate source of fuel.
Correct Answer is B
Explanation
A. bone; adipose:Bone is the most solid connective tissue, providing structural support and protection. Adipose tissue, while soft and pliable, is not the most fluid connective tissue since it primarily stores fat rather than circulating or transporting substances.
B. bone; blood:Bone is the densest and most rigid connective tissue, providing support, protection, and leverage for movement. Blood is the most fluid connective tissue, circulating throughout the body to transport nutrients, gases, hormones, and waste products.
C. hyaline cartilage; areolar:Hyaline cartilage is firm but not as rigid as bone, and areolar connective tissue is loose and supportive but not fluid; it serves as a cushioning and binding tissue rather than a circulating medium.
D. fibrocartilage; areolar:Fibrocartilage is tough and less compressible than hyaline cartilage but is still less solid and rigid than bone. Areolartissue is a viscous, gel-like matrix that is not the most fluid type.
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