Sliding Filament Theory Quiz 1

First lets see if you remember what some of the structures are before we move on.

1. A cylindrical organelle running the length of the muscle fibre, containing Actin and Myosin filaments.

Myofibril

Actin

Sarcomere

Myosin


2. The functional unit of the Myofibril, divided into I, A and H bands.

Myofibril

Actin

Sarcomere

Myosin


3. A thin, contractile protein filament, containing 'active' or 'binding' sites.

Myofibril

Actin

Sarcomere

Myosin


4. A thick, contractile protein filament, with protusions known as Myosin Heads.

Myofibril

Actin

Sarcomere

Myosin


5. An actin-binding protein which regulates muscle contraction.

Tropomyosin

Actin

Sarcomere

Myosin