Multiple Choice
Which of the following is NOT a characteristic of epithelial tissue?
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4. Tissues & Histology
Characteristics of Epithelial Tissue
1:18 minutesProblem 5
Textbook Question
The most abundant connections between cells in the superficial layers of the skin are
(a) Connexons
(b) Gap junctions
(c) Desmosomes
(d) Tight junctions
Verified step by step guidance1
Step 1: Understand the types of cell junctions mentioned in the options. Connexons are protein complexes that form gap junctions, which allow communication between cells by permitting the passage of ions and small molecules.
Step 2: Recognize that gap junctions (option b) are specialized for cell-to-cell communication but are not the most abundant in the superficial layers of the skin.
Step 3: Tight junctions (option d) create a seal between cells to prevent leakage of extracellular fluid, commonly found in epithelial tissues but not the most abundant in the skin's superficial layers.
Step 4: Desmosomes (option c) are strong adhesive junctions that connect the cytoskeletons of adjacent cells, providing mechanical strength and resistance to stress, especially important in the skin's outer layers.
Step 5: Conclude that the most abundant connections between cells in the superficial layers of the skin are desmosomes, as they maintain the structural integrity of the skin under mechanical stress.
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Video duration:
1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Desmosomes
Desmosomes are strong, adhesive cell structures that connect adjacent cells, especially in tissues subject to mechanical stress like the skin. They provide structural integrity by linking the cytoskeletons of neighboring cells, making them abundant in the superficial layers of the skin.
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Gap Junctions
Gap junctions are specialized intercellular connections that allow direct communication between cells through channels called connexons. They enable the transfer of ions and small molecules but are less abundant in the skin's superficial layers compared to desmosomes.
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Tight Junctions
Tight junctions create a seal between adjacent cells to prevent the passage of molecules and ions through the space between cells. While important for barrier function, they are not the most abundant connections in the superficial skin layers.
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