intercellular junctions Flashcards

1
Q

what are tight junctions also called as

A

zonular occludens

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2
Q

what region of tj in cells is connected to each other

A

the apical region of adjacent cells are tightly packed by protiens

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3
Q

what’s the function of tj

A

prevention of leakage

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4
Q

the function of gap junction

A

communication between the cells (exchange of ions, small or big molecules)

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5
Q

how are cells connected to e/o by gp

A

thro cytoplasm with e/o

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6
Q

what is the function of adhering junction

A

it cements the neighbouring junctions together

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7
Q

what is the microfilament of aj composed of

A

has mainly actin and also keratin like protiens

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8
Q

presence or absence of intercellular proteins in zonular adherans

A

its absent

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9
Q

what are desmosomes

A

they are similar to zonular adherans, they have plague-like structures on the side facing cytoplasm, they have intercellular proteins, and their microfilaments also called tonofibrils are made up of keratin protein

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10
Q

explain hemidesmosomes

A

they connect BM and cell to one another, microfilament and intercellular proteins are only present on one side, you can say they are half structure of desmosomes.

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11
Q

difference between desmosomes and hemidesmosomes

A

hemidesmosomes connect cell to BM and desmosomes connect cell to cell

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