Cell Junctions (ORAL SCIENCE)

Question 1

What is a cell junction

Answer 1

Points of contact between adjacent plasma membranes

Question 2

5 important types of junctions include:

Answer 2

• Tight junctions
• Adherens junctions
• Desmosomes
• Hemidesmosomes
• Gap junctions

Question 3

What is an intercellular junction

Answer 3

Intercellular junction:
Tissues are formed by
grouping cells together using
a variety of Intercellular
Junctions .

Question 4

Explain tight cell junction

Answer 4

• found where a leakproof seal is needed between cells.
  
  • keep materials from leaking out of organs like the stomach and bladder.

Question 5

Explain GAP cell junction

Answer 5

pores (connexons) that allow small substances like ions to pass between cells
( Heart cells )

Question 6

Explain Adherens junction

Answer 6

make an adhesion belt (like the belt on your pants) that keeps tissues from separating as they stretch and contract.
* Cadherin : glycoprotein
that forms the belt-like
“plaque”.
Prevent the cells from separating. Protein belt prevents.
Found in skin and bladder cells

Question 7

Explain Desmosomes junctions

Answer 7

act as “spot welds”.
* cadherin glycoprotein
* (plus intermediate filaments)
* to hook into the cytoplasm.
Like staples, allowing cells to stretch but not separate. Less strong to adherence
Allow the cells to still carry out their function.

Question 8

Explain Hemidesmosomes junctions

Answer 8

• half-welds that join cells to the basement membrane.
  Between a cell and a basement membrane