Skeletal Muscle: Structure and Contraction Quiz

What is the primary function of skeletal muscle?

• To produce movement

• To store calcium

• To transport oxygen

• To generate electrical impulses

Which connective tissue layer surrounds an entire muscle?

• Sarcolemma

• Epimysium

• Perimysium

• Endomysium

What is the role of the sarcolemma in muscle fibers?

• Stores calcium ions

• Conducts action potentials

• Synthesizes proteins

• Produces ATP

What is the functional unit of a skeletal muscle fiber?

• Myofibril

• Sarcomere

• Fascicle

• Myosin

Which protein complex prevents myosin from binding to actin?

• Sarcoplasmic reticulum

• Myosin-actin complex

• Calcium-ATPase complex

• Tropomyosin-troponin complex

What triggers the release of calcium ions from the sarcoplasmic reticulum?

• Muscle relaxation

• Action potential in T-tubules

• Presence of lactic acid

• Binding of ATP

What is the role of ATP in muscle contraction?

• To bind calcium ions

• To detach myosin heads from actin

• To form cross-bridges

• To depolarize the sarcolemma

Tags

NGSS.HS-LS1-7

Which process provides the most ATP for muscle contraction?

• Fermentation

• Aerobic respiration

• Anaerobic glycolysis

• Creatine phosphate metabolism

Tags

NGSS.HS-LS2-3

What happens during the power stroke of muscle contraction?

• ATP is synthesized

• Calcium ions are released

• Actin filaments slide past myosin filaments

• Myosin heads detach from actin

What is the role of acetylcholine at the neuromuscular junction?

• To store energy

• To trigger muscle fiber depolarization

• To bind to myosin heads

• To degrade calcium ions