Class 11 Zoology simulations · Locomotion and Movement

Sliding filament theory

Contract a sarcomere: thin actin filaments slide over thick myosin filaments, pulling the Z lines together.

Open the simulation

What to notice

The filaments themselves do not shorten — they slide past each other using cross bridges powered by ATP.

Key relation

A band constant ; I band and H zone shorten during contraction

Try this

Contract fully. Which band disappears first?

What you can change

• Contraction: 0 to 100 %
• Ca²⁺ released?: choose Yes (stimulated), No (relaxed)

More in Locomotion and Movement

• The human skeleton: 206 bones
• Synovial joints

See all Class 11 Zoology simulations or every Physica simulation.