9. Muscle Tissue

Which of the following proteins makes up the thick filament of the sarcomeres?

In the context of the sliding filament theory, what protein primarily composes the thin myofilaments within a skeletal muscle sarcomere?

Thin filaments are composed of how many strands of fibrous actin?

Which two proteins slide past each other in the sliding filament theory of muscle contraction?

What is the area in the center of the A band where there are no actin myofilaments?

What is the consequence if the myosin heads cannot bind to the actin during muscle contraction?

Which of the following regions of a sarcomere contain thin filaments?

Which of the following is most directly required to initiate the coupling of myosin to actin in the sliding filament theory?

What is the role of calcium in the cross-bridge cycle during muscle contraction?

Which of the following best describes the term 'Z line' in the context of the sliding filament theory and the sarcomere?

In the sliding filament theory, what causes the myosin head to disconnect from actin?

What happens when a myosin head releases from actin during muscle contraction?

What happens when troponin and tropomyosin block the active sites of actin in the sarcomere?

In the context of sliding filament theory, what is the basic functional (contractile) unit of skeletal muscle?

What does the sliding filament model describe during muscle contraction?