⚙️ SET 10: Sliding Filament Model
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11 Terms
What is the sliding filament model?
The process where thin filaments slide past thick filaments to shorten muscle
Do actin and myosin change length during contraction?
No, they stay the same length
What actually shortens during contraction?
The sarcomere
What happens when myosin heads bind to actin?
A cross-bridge forms and sliding begins
How do myosin heads generate movement?
They repeatedly bind, pull, and release actin
What happens to Z discs during contraction?
They move closer together
What happens to the I band during contraction?
It shortens
What happens to the H zone during contraction?
It shortens or disappears
What happens to the A band during contraction?
It stays the same length
What happens in a fully contracted muscle?
The H zone disappears and actin overlaps completely
Why does the muscle shorten overall?
All sarcomeres shorten at the same time
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