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Muscle Physiology Quiz: Excitation-Contraction Coupling

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Muscle Physiology Quiz: Excitation-Contraction Coupling

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Questions and Answers

What is the primary function of the DHP receptor in muscle contraction?

Binding of ATP to the myosin head

Binding of ACh to the motor end plate

Initiation of muscle action potential

Regulation of Ca2+ release from the sarcoplasmic reticulum (correct)

What is the purpose of the tropomyosin and troponin complex in muscle contraction?

To regulate the binding of actin and myosin (correct)

To generate the power stroke

To release Ca2+ from the sarcoplasmic reticulum

To transmit the muscle action potential

What is the source of immediate energy for muscle contractions?

ATP stored in the muscle fiber (correct)

Breakdown of muscle proteins

Anaerobic glycolysis

Aerobic cellular respiration

What is the effect of Ca2+ binding to troponin?

Enhanced actin-myosin binding (B) Signup and view all the answers

What is the role of the T-tubule in muscle contraction?

Transmission of the muscle action potential (B) Signup and view all the answers

What is the net effect of the muscle contraction process?

Actin filament moves towards the M line (B) Signup and view all the answers

What is the angle of the crossbridge relative to the filaments when 2 ATP binds to its binding site on the myosin?

45° (D) Signup and view all the answers

What is the main mechanism of muscle contraction according to the sliding filament theory?

Thin actin filaments sliding past thick myosin filaments (B) Signup and view all the answers

What happens to the ATP after the ATPase activity of myosin?

It is converted into ADP and Pi (D) Signup and view all the answers

What is the role of tropomyosin in the relaxed state of muscle?

It blocks the binding sites on actin, preventing myosin binding (D) Signup and view all the answers

What is the energy source for muscle contraction?

ATP (B) Signup and view all the answers

What initiates the power stroke in muscle contraction?

The release of Pi from the myosin head (B) Signup and view all the answers

What is the result of the movement of actin filaments in relation to myosin filaments during muscle contraction?

The sarcomere shortens (D) Signup and view all the answers

What is the state of the myosin head at the end of the power stroke?

Tightly bound to the actin molecule (A) Signup and view all the answers

What is the purpose of the myosin head rotating on its hinge during the power stroke?

To push the actin filament past it (A) Signup and view all the answers

What is the role of troponin in muscle contraction?

It binds to calcium ions and pulls tropomyosin away from actin's myosin-binding site (B) Signup and view all the answers

What is the result of the binding of calcium ions to troponin?

Tropomyosin is pulled away from actin's myosin-binding site (D) Signup and view all the answers