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.
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Related Questions
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.
Correct Answer is A
Explanation
A. quantity of melanin produced:Ethnic variations in skin color are due to differences in the amount and type of melanin synthesized and distributed by melanocytes. While all humans have roughly the same number of melanocytes, the activity level of these cells determines pigment intensity.
B. quantity of hemoglobin in the blood:Hemoglobin contributes to skin tone by giving a reddish or pinkish hue, especially in lighter skin. However, it does not account for the baseline differences in ethnic skin color.
C. UV radiation exposure:Sun exposure can increase melanin production temporarily, leading to tanning. However, long-term ethnic differences are genetically determined rather than solely influenced by environmental UV exposure.
D. number of keratinocytes:Keratinocytes are the primary cells of the epidermis and act as recipients of melanin granules from melanocytes. Their number does not vary significantly among ethnic groups and does not explain differences in skin color.
E. number of melanocytes:The number of melanocytes is relatively consistent across all ethnicities. It is the rate of melanin synthesis and the type of melanin produced that create the observed differences in skin pigmentation.
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