6.7 intercellular junctions

Question 1

what connects plant cells

Answer 1

plasmodesmata channels

–cytoplasm is shared between 2 cells

Question 2

what connects animal cells

Answer 2

tight junctions
desmosomes
gap junctions

Question 3

where are intercellular junctions common in animals

Answer 3

epithelial tissue

-lining inside and outside of body

Question 4

tight junction

Answer 4

membranes are pressed together very tight,

• bound together by proteins that form a continuous seal
• prevent leakage of extracellular fluid across epithelial cells

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Question 5

Desmosomes

Answer 5

-AKA anchoring junctions
-fastens cells together in strong sheets
-intermediate filaments made of keratin proteins
anchor desmosomes in the cytoplasm

-muscle cells are attached to each other like this

Question 6

Gap junctions

Answer 6

• AKA communicating junctions
• have cytoplasmic channels
• membrane proteins surround pores where ions can pass