Muscle tissue - Skeletal muscle fibers are organized into repeating functional units that contain sliding filaments
19 important questions on Muscle tissue - Skeletal muscle fibers are organized into repeating functional units that contain sliding filaments
What does striated muscle mean?
What is the sarcolemma and sarcoplasm?
What are transverse tubules, or T tubules?
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What is the sarcoplasmic reticulum (SR)?
What is terminal cisternae?
What is a triad?
What is a myofibril? What about myofilaments?
What does a sarcomere contain?
- Thick filaments
- Thin filaments
- Proteins that stabilize the positions of the thick and thin filaments
- Proteins that regulate the interactions between thick and thin filaments
What is the A band in a sarcomere?
- M line
- H band
- Zone of overlap
What is the M line?
What are the four main proteins that thin filament contains?
- Filamentous actin (F-actin)
- Nebulin
- Tropomyosin
- Troponin
What is the function of nebulin?
What is the function of tropomyosin and troponin?
What has to happen to the troponin-tropomyosin complex when contraction has to occur?
What happens to a sarcomere when a skeletal muscle fiber contracts?
- The H bands and I bands of the sarcomeres narrow
- The zones of overlap widen
- The Z lines move closer together
- The width of the A band remains constant
What is the sliding-filament theory?
Describe the components of a sarcomere.
Why do skeletal muscle fibers appear striated when viewed through a light microscope?
Where would you expect to find the greatest concentration of Ca2+ in a resting skeletal muscle fiber?
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