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Chapter 4: Epithelial Tissue

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Functions of the basement membrane include which of the following?

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a. Contractility

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b. Molecular filtering

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c. Active ion transport

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d. Excitability

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e. Modification of secreted proteins

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Using immunohistochemistry a population of cells is shown to be positive for the protein connexin. From this we can infer that the cells are connected by what type of junction?

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a. Tight (occluding) junctions

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b. Zonula adherens

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c. Gap junctions

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d. Hemidesmosomes

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e. Desmosomes (macula adherens)

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An individual genetically unable to synthesize normal occludin is likely to have epithelia with defective regulation in which of the following?

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a. Material crossing the epithelium between the cells (paracellular movement)

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b. Communication between the cells

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c. Attachment to the basement membrane

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d. Strong attachment to neighboring cells

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e. Movement of membrane proteins in the apical domains of cells

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An intermediate filament protein found in cytoplasm of most epithelial cells is which of the following?

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a. Actin

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b. Vimentin

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c. Laminin

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d. Myosin

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e. Keratin

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Which of the following cellular features is used in naming types of epithelia?

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a. Shape of cells in the basal layer

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b. Number of cell layers

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c. Presence of a basal lamina

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d. Size of the nuclei

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e. Nature of the cell junctions that are present

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The release of lipid droplets from cells is which type of secretion?

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a. Merocrine

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b. Serous

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c. Apocrine

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d. Mucous

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e. Holocrine

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Exocrine glands in which the acini ...

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