Skeletal Muscle Contraction Quiz

What is another name for the skeletal muscle contraction theory?

• Calcium binding theory

• Muscle relaxation theory

• Sliding filament theory

• Excitation theory

Who proposed the sliding filament theory?

• Charles Darwin

• AE Huxley and H Huxley

• Isaac Newton

• Albert Einstein

What is the primary component of the thick filament in a sarcomere?

• Actin

• Troponin

• Tropomyosin

• Myosin

What is the role of ATP in muscle contraction?

• It acts as a neurotransmitter

• It binds to myosin heads and is hydrolyzed to provide energy

• It provides energy for muscle relaxation

• It binds to actin to initiate contraction

What happens when calcium binds to troponin C?

• The sarcomere lengthens

• The muscle relaxes

• The active sites on actin are uncovered

• ATP is synthesized

What is the role of the troponin-tropomyosin complex in muscle contraction?

• It releases calcium ions

• It binds to myosin heads

• It covers the active sites on actin in a relaxed muscle

• It initiates ATP synthesis

What is the power stroke in muscle contraction?

• The tilting of the myosin head pulling actin towards the sarcomere center

• The binding of ATP to myosin

• The detachment of myosin from actin

• The release of calcium from the sarcoplasmic reticulum

What causes the detachment of the myosin head from actin?

• Release of calcium

• Binding of a new ATP molecule

• Conformational change in troponin

• Hydrolysis of ADP

What is the result of the power stroke in muscle contraction?

• Calcium is released from the sarcoplasmic reticulum

• ATP is synthesized

• The thin filament slides over the thick filament

• The muscle relaxes

Which part of the sarcomere remains constant during contraction?

• I band

• H zone

• A band

• Z line