Question
Area marked by the arrow in the given figure contain all the following, except:
| A. |
Zona occludens
|
| B. |
Fascia adherens
|
| C. |
Macula adherens
|
| D. |
Gap junction
|
Show Answer
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Correct Answer � A
Explanation
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Ans: A. Zona occludens
- Given diagram is showing intercalated discs of cardiac muscle containing all types of cellular junctions except occluding tight junction (Zona occludens).
Intercalated disc:
- Junctional complex between neighbouring cells in cardiac muscle cells.
- Interdigitating transverse parts of intercalated disc form a fascia adherens, with numerous desmosomes.
- Gap junctions are found in longitudinal parts of disc.
Zonula occludens:
- Type of junction that tie cells together & endow tissues with strength and stability.
- Also referred as “tight junctions”.
- Characteristically surround apical margins of cells in epithelia (intestinal mucosa, renal tubular walls & choroid plexus).
Other cells:
- Desmosome & zonula adherens help to hold cells together.
- Hemidesmosome & focal adhesions attach cells to their basal laminas.
