Sliding Filament Theory Quiz

What does Huxley’s Sliding Filament Theory explain?

• How muscles contract

• How muscles relax

• How muscles grow

• How muscles atrophy

What are muscles made up of according to the theory?

• Myofibrils consisting of actin and myosin

• Myofibrils consisting of collagen and elastin

• Myofibrils consisting of keratin and fibrin

• Myofibrils consisting of hemoglobin and myoglobin

Which region is located between the Z Line and the start of the A bands and contains thin filaments?

• I Band

• A Band

• Z Line

• H Zone

Which area of the sarcomere is located at its center?

• I Band

• A Band

• Z Line

• H Zone

What happens to the distance of the two Z Lines when a muscle contracts?

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the thick filament in muscle fibers known as?

• Actin

• Myosin

• Tropomyosin

• Troponin

How many troponin molecules are on each tropomyosin strand?

• 1

• 2

• 3

• 4

What triggers the movement of tropomyosin from actin?

• Release of ATP

• Release of calcium ions

• Release of myosin

• Release of actin

What stops the continued contraction of muscles?

• Release of calcium ions

• Release of ATP

• Release of myosin

• Release of actin