What make the striation on muscle tissue

[299678]

I know T tubules of sarcolemma on skeletal muscle make its striation
but what about cardiac muscle? T tubules make its striation or intercalated disc

---

Members don't see this ad.

 

[joonkimdds]

If I remember it correctly, it's intercaltated disc.

 

[dentalWorks]

I always thought the term striation always referred to the actin & myosin interacting inbetween each other

 

[azar87]

Striations are due to the thin actin and thick myosin filaments overlapping each other.

 

[299678]

then, smooth muscle doesn't have actin and myosin filament since smooth muscle has no striation?

 

[dentalWorks]

then, smooth muscle doesn't have actin and myosin filament since smooth muscle has no striation?

I belive they still have Actin / myosin, however, its a different mechanism than cardiac/voluntary muscle

 

[sfoksn]

smooth muscles don't have striations because the filaments are not all lined up like in skeletal/cardian muscle.

 

[jay47]

I belive they still have Actin / myosin, however, its a different mechanism than cardiac/voluntary muscle

Exactly. Smooth muscle has actin and myosin lined up across across "dense bodies" in a diamond shaped pattern (see- http://www.mona.uwi.edu/fpas/courses/physiology/muscles/Smooth_Muscle.htm ), unlike skeletal and cardiac which have it lined up in parallel rows. The Thick "A bands" which represent the thick filaments of myosin are the actual "lines you see histologically.

 

[299678]

hey jay ~ Thanks for explanation. Do you know what sphincter has striated muscle and what sphincter has not?