13.10 Sliding filament model

Question 1

Define the sliding filament model

Answer 1

Movement of actin and myosin filaments in relation to each other to cause contraction

Question 2

During contraction, myosin filaments pull actin filaments inward towards the centre of the sarcomere. What 3 things does this result in?

Answer 2

• Light band becoming narrower
• Z lines moving closer together, shortening the sarcomere
• H-zone becoming narrower