Question at position 11 Which of the following statements accurately describes epithelial tissue?The basal surface of epithelial cells is not connected to the basement membraneEpithelial cells do not show polarityEpithelial tissue has direct access to blood vesselsEpithelial tissue cannot regenerateEpithelial cells are conected by specialized junctions

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BlackTom AI · Accepted Answer

Let's parse the question and each statement about epithelial tissue to review what is true and what is false.
Option 1: 'The basal surface of epithelial cells is not connected to the basement membrane' This is incorrect. In reality, the basal surface is firmly attached to the basement membrane, which helps anchor the epithelium to underlying connective tissue and provides support.
Option 2: 'Epithelial cells do not show polarity' This is false. Epithelial cells exhibit polarity, with an apical surface facing the lumen or external environment and a basal surface attached to the basement membrane, along with distinct membrane specializations on each side.
Option 3: 'Epithelial tissue has direct access to blood vessels' This statement is inaccurate. Epithelial tissue is avascular; nutrients and gases reach the cells by diffusion from underlying connective tissue that contains blood vessels.
Option 4: 'Epithelial tissue cannot regenerate' This is incorrect. Epithelial tissues have a high regenerative capacity, renewing themselves rapidly after injury through stem or progenitor cells located in various regions.
Option 5: 'Epithelial cells are conected by specialized junctions' This statement is true. Epithelial cells are joined by specialized cell–cell junctions (such as tight junctions, adherens junctions, desmosomes, and gap junctions) that maintain tissue integrity, regulate paracellular transport, and coordinate signaling.
In summary, only the final option correctly describes a fundamental feature of epithelial tissue—that epithelial cells are connected by specialized junctions—while the other options describe characteristics that are not accurate for epithelia. The incorrect options misstate anchorage to the basement membrane, cellular polarity, vascularity, and regenerative capacity, which are key distinctions in epithelial biology.

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