Which cells are commonly found wedged between simple columnar epithelial cells and secrete mucus?
goblet cells
mast cells
fibroblasts
macrophages
The Correct Answer is A
A. goblet cells: Goblet cells are specialized epithelial cells interspersed among simple columnar cells. They secrete mucus that lubricates and protects the lining of organs such as the intestines and respiratory tract.
B. mast cells: Mast cells are found in connective tissue, where they release histamine and other chemical mediators during immune responses. They are not embedded within epithelial layers.
C. fibroblasts: Fibroblasts are connective tissue cells that produce collagen and extracellular matrix. They do not secrete mucus or reside within epithelial layers.
D. macrophages: Macrophages are immune cells present in connective tissue and the bloodstream that perform phagocytosis. They are not positioned between epithelial cells for mucus secretion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. stratum granulosum:The stratum granulosum is usually present in most areas of the epidermis. It contains keratohyalin granules that contribute to keratin formation, which helps strengthen the skin barrier.
B. stratum lucidum:The stratum lucidum is a clear layer found only in thick skin, such as the palms of the hands and soles of the feet. It is absent in most of the body’s epidermis, which is classified as thin skin.
C. stratum corneum:The stratum corneum, composed of layers of dead keratinized cells, is always present in the epidermis. It serves as the outer protective layer against environmental factors.
D. stratum basale:The stratum basale is the deepest layer of the epidermis. It contains dividing keratinocytes and melanocytes and is always present to support skin regeneration.
E. stratum spinosum:The stratum spinosum lies above the basal layer and provides strength and flexibility to the skin. It is consistently present in the epidermis across most of the body.
Correct Answer is B
Explanation
A. collagen, elastin, and reticular fibers:These are the main types of fibers found in connective tissue, providing strength, elasticity, and support, but they do not represent all three main components.
B. ground substance, fibers, and cells:Connective tissue is composed of cells (such as fibroblasts, macrophages, and adipocytes), fibers (collagen, elastin, reticular), and ground substance (a gel-like material that fills the extracellular space). These three components work together to provide support, strength, and a medium for nutrient and waste exchange.
C. alveoli, fibrous capsule, and secretory cells:These structures are specific to glands or organs like the lungs, not general components of connective tissue.
D. fibroblasts, chondroblasts, and osteoblasts:These are specific types of connective tissue cells responsible for producing matrix in different connective tissues, but they do not account for fibers and ground substance, so they are not the three main components
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