Sliding Filament Theory

Do the lengths of the thick and thin filaments change during contraction?

• Yes

• No

What state is the sarcomere in

• Relaxed

• Contracting

• Fully Contracted

• None of the above

Thick filaments within a myofibril are:

• ATPase

• Sarcoplasmic reticulum

• Actin

• Myosin

Thin filaments in a myofibril are

• Sarcomeres

• Sarcoplasm

• Actin

• Myosin

Explain the sliding filament theory of muscle contraction.

• Actin filaments slide over myosin filaments, shortening the sarcomere and causing muscle contraction.

• Myosin filaments slide over actin filaments, lengthening the sarcomere and causing muscle relaxation.

• Actin and myosin filaments remain stationary, and the sarcomere changes length.

• Myosin filaments dissolve, allowing actin filaments to contract.

Tags

DOK Level 2: Skill/Concept

Which events occur during stage 5 of the Sliding Filament Theory? (Select 2)

• ATP splits into ADP & Pi

• Cross-bridge detaches

• Myosin head reloads for next stroke

• Nerve impulse reaches muscle cell

Which filament slides inward during muscle contraction

• Actin

• Myosin

What is the role of ATP in the sliding filament theory?

• ATP binds to actin, causing it to slide over myosin.

• ATP provides the energy for myosin heads to detach from actin and reattach for another cycle.

• ATP is not involved in the sliding filament theory.

• ATP binds to calcium ions, facilitating muscle contraction.

Tags

DOK Level 2: Skill/Concept

What is the primary function of the sarcomere in muscle contraction?

• To store calcium ions

• To generate force through the sliding of actin and myosin filaments

• To transport nutrients to muscle cells

• To produce ATP

Tags

DOK Level 1: Recall

The sliding filament theory explains which of the following?

• muscle extensions

• muscle inductions

• muscle contractions

• muscle formation