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What are the functions of Hemidesmosomes?
Important Questions on Animal Tissue
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_____ cell junction is mediated by integrin.
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a. Tight junction helps connecting the cytoplasm and adjoining cells.
b. Adhering junction helps to stop substances from leaking across a tissue.
c. Gap function keeps neighbouring cells together.
d. Ions & small molecules and rarely large molecules quickly transports through gap junction.
How many of the above statements are incorrect?
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Fill in the blank with the correct answer from the bracket.
Desmosomes are the dense plaque-like structure on the cytoplasmic side of each _____ from which microfilaments extend to the cytoplasm. (cell wall, plasma membrane, nuclear membrane)
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I. Gap junctions cement adjacent cells together.
II. Areolar tissue contains fibroblasts, macrophages and mast cells.
III. Tight junctions facilitate the cells to communicate with each other.
IV. Adhering junctions help to stop substances from leaking across tissues.
V. Cells of connective tissue except blood secrete fibres of structural proteins called elastin.
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(i) All the cells of the epithelium are held together with little intercellular materials.
(ii) In almost all animal tissues specialised junctions provide both structural and functional link between their individual cells.
(iii) Tight junctions prevent substances from leaking across a tissue.
(iv) Adhering junctions provide cementing to keep neighbouring cells together.
(v) Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.
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Which junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules:-
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Fill in the blank with the correct word given in the bracket.
_____ (Gap/Adherens) cell junction is mediated by integrin.
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A) _______ helps to stop substance from leaking cross a tissue.
B) In all connective tissue except, _______ the cells secrete fibres.
C) ________ cells produce and secrete fibres in connective tissue.
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