Musculoskeletal System Responses to Exercises Quiz

What is the basic functional unit for force production in a muscle fiber?

• Myosin

• Actin

• Sarcomere

• Tropomyosin

Which type of muscle contraction causes the muscle fiber to shorten?

• Isometric Contraction

• Concentric Contraction

• Eccentric Contraction

• Tetanus

What is the primary source of ATP for muscle contraction?

• All of the above

• Oxidative Phosphorylation

• Glycolysis

• Phosphocreatine (PC)

Which theory explains the muscle contraction process through the interaction of Actin and Myosin?

• Force Velocity Theory

• Length Tension Theory

• Sliding Filament Theory

• Excitation-Contraction Coupling

What is the role of Tropomyosin and Troponin in muscle contraction?

• Release of Ca++

• Prevent the attachment of myosin to actin

• Bending of actin with myosin

• Energy generation for muscle contraction

Which type of muscle fibers are fatigue-resistant and are found in postural muscles?

• Fast-twitch oxidative-glycolytic (type IIa)

• All of the above

• Slow-twitch oxidative (type I)

• Fast-twitch glycolytic (type IIb)

What happens to the force generated by eccentric contractions compared to concentric contractions?

• It varies based on muscle type

• It remains the same

• It decreases

• It increases

What is the hierarchical structure of skeletal muscle composed of?

• Tropomyosin, Calcium, ATP

• Actin, Myosin, Troponin

• Fascicles, Myofibers, Sarcomeres

• Epimysium, Perimysium, Endomysium

Which factor determines the mechanical behavior and force generation of a muscle?

• Physiology of muscle fiber force generation

• Muscle fibers type

• Recruitment of muscle fibers

• Motor unit size

What is the function of the binding site where myosin binds to actin?

• Stretch the actin filament

• Initiate muscle contraction

• Generate energy for muscle contraction

• Prevent muscle relaxation