Sarcomere Anatomy Quiz

What is the function of sarcomeres?

• To shorten muscles

• To contract and relax muscles

• To bind to actin

• To hold together myosin myofilaments

Which myofilament is thick?

• Actin

• Z line

• M line

• Myosin

What is the boundary between sarcomeres called?

• H zone

• I bands

• M line

• Z line

Which band contains the entire length of a thick filament?

• H zone

• A band

• M line

• I bands

What happens to the myofilaments in a contracting sarcomere?

• They hold together myosin myofilaments

• They become thicker

• They bind to actin

• They shorten

What is the role of actin in muscle contraction?

• It provides energy for contraction

• It binds to myosin to facilitate contraction

• It acts as a structural support

• It releases calcium ions

What is the function of the M line in a sarcomere?

• It marks the boundary between sarcomeres

• It holds the thick filaments in place

• It is where actin and myosin overlap

• It releases calcium ions during contraction

What happens to the H zone during muscle contraction?

• It shortens

• It lengthens

• It remains the same

• It disappears