Sarcomere Quiz

What is the fundamental contractile unit of striated muscle fibers?

• Sarcomere

• Actin band

• Z line

• Myofibril

Which region of the sarcomere contains both thick and thin filaments?

• H zone

• M line

• A band

• I band

During muscle contraction, what happens to the I bands and H zone?

• They change color

• They disappear or shorten

• They remain constant

• They increase in size

What is the process driven by the sliding filament theory?

• Thick filaments sliding past thin ones

• M line holding the thick filaments together

• Thin filaments sliding past thick ones

• Z lines moving farther apart

What is essential for muscle function and enables movements ranging from fine motor tasks to powerful locomotion?

• M line centering

• A band length

• Z line anchoring

• Sarcomere contraction

Tags

NGSS.HS-LS1-7