Quiz on Ultra Structure of Skeletal Muscle

What is the connective tissue layer around the muscle called?

• Perimysium

• Endomysium

• Epimysium

• Sarcomere

What is the contractile unit of the muscle called?

• Fascicle

• Sarcomere

• Myofibril

• Muscle Fiber

Which band is made of highly refractile material?

• A-band

• Z-line

• H-band

• I-band

What type of protein is myosin classified as?

• Contractile protein

• Attachment protein

• Regulatory protein

• Structural protein

What is the role of tropomyosin in muscle contraction?

• Anchors thin filaments

• Covers the binding site of actin

• Binds to calcium

• Connects Z line to M line

Which protein helps in the transfer of force from the contractile system?

• Nebulin

• Dystrophin

• Desmin

• Titin

What is the function of the T-system?

• Stabilizes actin filaments

• Transmits action potential

• Anchors thick filaments

• Prevents muscle contraction

What is the main role of the DHP receptor?

• Conducts calcium

• Acts as a voltage sensor

• Releases ATP

• Binds to actin

What is the function of the ryanodine receptors?

• Release calcium into the cell

• Bind to tropomyosin

• Stabilize myofibrils

• Connect Z line to M line

Which protein anchors the thin filaments to the Z line?

• Nebulin

• Titin

• Alpha actinin

• Desmin