- Smooth muscles
- Cardiac muscles
- Skeletal muscles
These are the muscles, which are found in the walls of the organs. Such as blood vessels, digestive tract etc. They are actually involved in the movement of the material flowing through such organs.
2. Are not under the voluntary control.
3. The fibers are branched and interconnected.
4. Help the heart in the pumping of blood.
5. Speed of contraction is intermediate.
2. Can be controlled voluntarily.
3. Speed of contraction may be slow or fast.
4. Alternate dark and light bands are present.
The dark band is called A-band,since it is anistropic (polarizing i.e, it can polarize visible light).
The light band is called I-band,since it is isotropic ( Non-polarizing)
Now, the A-band and I-band are further divided into different lines.
The A-band which is the dark band has a middle brighter strip which is called the H-Zone( h for hele,means bright). This is the region of A-band where the filaments do not overlap and only myosin filaments are present.
The H-zone has a middle line called, M-Line. It is a dark line.
This is the mid line of the light band,I-Band. ( Z for zwishen, means between)
- Thin filaments
- Thick filaments
Points to note:
- The thick filaments are present along the A-band.
- The thin filaments are present along the I-band.
Tropomyosin And Troponin: