Quiz on Sliding Filament Theory and Muscle Contraction

What is the basic unit of contraction in a myofibril?

• Fascicle

• Muscle Fibre

• Myofibril

• Sarcomere

Which filament is the thinner of the two in a sarcomere?

• Myosin

• Actin

• Tropomyosin

• Troponin

What structure surrounds myofibrils and stores calcium ions?

• Z-Line

• Sarcoplasmic Reticulum

• M-Line

• A-Band

What is the role of tropomyosin in muscle contraction?

• Promotes contraction

• Blocks contraction

• Stores calcium

• Secures myosin

Where are myosin filaments primarily located in a sarcomere?

• H-Zone

• Z-Line

• I-Band

• A-Band

What is the function of troponin?

• Stores calcium

• Promotes contraction

• Secures actin

• Blocks contraction

What is the dark section of a sarcomere called?

• I-Band

• A-Band

• Z-Line

• H-Zone

What is the light section of a sarcomere known as?

• I-Band

• H-Zone

• A-Band

• M-Line

What is the function of the sarcoplasmic reticulum during muscle contraction?

• Release calcium

• Secure Z-lines

• Store actin

• Block myosin

What is being shown in the diagram? It includes sections of sarcomeres joined parallel to one another.

• Myofibril

• Individual Muscle Fibre

• Skeletal Muscle

• Sarcomere