Podcast
Questions and Answers
What is the primary function of the DHP receptor in muscle contraction?
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?
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?
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?
What is the effect of Ca2+ binding to troponin?
What is the role of the T-tubule in muscle contraction?
What is the role of the T-tubule in muscle contraction?
What is the net effect of the muscle contraction process?
What is the net effect of the muscle contraction process?
What is the angle of the crossbridge relative to the filaments when 2 ATP binds to its binding site on the myosin?
What is the angle of the crossbridge relative to the filaments when 2 ATP binds to its binding site on the myosin?
What is the main mechanism of muscle contraction according to the sliding filament theory?
What is the main mechanism of muscle contraction according to the sliding filament theory?
What happens to the ATP after the ATPase activity of myosin?
What happens to the ATP after the ATPase activity of myosin?
What is the role of tropomyosin in the relaxed state of muscle?
What is the role of tropomyosin in the relaxed state of muscle?
What is the energy source for muscle contraction?
What is the energy source for muscle contraction?
What initiates the power stroke in muscle contraction?
What initiates the power stroke in muscle contraction?
What is the result of the movement of actin filaments in relation to myosin filaments during muscle contraction?
What is the result of the movement of actin filaments in relation to myosin filaments during muscle contraction?
What is the state of the myosin head at the end of the power stroke?
What is the state of the myosin head at the end of the power stroke?
What is the purpose of the myosin head rotating on its hinge during the power stroke?
What is the purpose of the myosin head rotating on its hinge during the power stroke?
What is the role of troponin in muscle contraction?
What is the role of troponin in muscle contraction?
What is the result of the binding of calcium ions to troponin?
What is the result of the binding of calcium ions to troponin?
