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anatomy > general histology > Flashcards

general histology Flashcards

1
Q

thickness of semi permeable membrane

A

70 angstrom

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2
Q

how many layers in a semi permeable membrane

A

3 layers
outer and inner are proteins
intermediate is lipids

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3
Q

other name of tight junctions

A

zonulae occludens

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4
Q

ridge like structure found in which cell junction

A

tight junction

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5
Q

which junction is in continuation with tight junction

A

zonulae adherens

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6
Q

tight junction found in

A

intestinal mucosa and renal tubule

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7
Q

what is a desmosome

A

adjacent membrane becomes thickened and the in between space is filled with filaments that radiate inwards

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8
Q

half of desmosome on basement membrane is called

A

hemidesmosome

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9
Q

CAMs full form

A

cell adhesion molecules

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10
Q

CAMs are found in

A

inflammation, wound healing , metastasis of tumous

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11
Q

nucleus is absent in which cells

A

mature RBCs

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12
Q

which is thicker nuclear or plasma membrane

A

nuclear membrane

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13
Q

is nuclear memebrane structurally similar to plasma membrane

A

yes

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14
Q

poorly stained chromatin

A

euchromatin ( transcriptionally active)

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15
Q

densely stained chromatin

A

heterochromatin ( transcriptionally inactive)

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16
Q

what is barr body composed of

A

inactive X chromosome

17
Q

where is it found in nerve cell and female cells

A

adjacent to nucleolus in nerve cells and inner surface of nuclear memebrane in females

18
Q

nature of cytoplasm

A

colloidal

19
Q

nucleolus disappears and reappears in

A

prophase and telophase

20
Q

why does nucleolus comprise of

A

RNA+ proteins

21
Q

does nucleolus have a membrane

A

no

22
Q

RER helps in

A

protein synthesis

23
Q

SER helps in

A

lipid and steroid synthesis

24
Q

what is endoplasmic reticulum

A

membrane bound tubules or vescicles

anatomy (5 decks)

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