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?

• Tetanus

• Eccentric Contraction

• Concentric Contraction

• Isometric Contraction

What is the primary source of ATP for muscle contraction?

• All of the above

• Phosphocreatine (PC)

• Glycolysis

• Oxidative Phosphorylation

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

• Excitation-Contraction Coupling

• Length Tension Theory

• Force Velocity Theory

• Sliding Filament Theory

What is the hierarchical structure of skeletal muscle composed of?

• Epimysium, Perimysium, Endomysium

• Fascicles, Myofibers, Sarcomeres

• Tropomyosin, Calcium, ATP

• Actin, Myosin, Troponin

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

• All of the above

• Fast-twitch glycolytic (type IIb)

• Fast-twitch oxidative-glycolytic (type IIa)

• Slow-twitch oxidative (type I)

What happens to the force of contraction when a muscle fiber is stretched beyond its optimal length?

• Force remains the same

• Force decreases

• Force increases

• Force becomes maximum

Which event leads to the release of Ca++ in muscle contraction?

• Tropomyosin Bending

• Action Potential

• Myosin Binding to Actin

• Troponin Preventing Attachment

What is the function of ATP in muscle contraction?

• To prevent muscle relaxation

• To provide energy for muscle contraction

• To release Ca++ in the cytoplasm

• To break down myosin filaments

Which type of muscle contraction generates more force than concentric contractions?

• Eccentric Contraction

• Concentric Contraction

• Isometric Contraction

• Tetanus