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Questions and Answers
Which of the following correctly sequences the events of muscle contraction?
Which of the following correctly sequences the events of muscle contraction?
- Action potential travels down the T-tubules, calcium ions are released from the sarcoplasmic reticulum, myosin heads bind to actin filaments, cross-bridges form and the sarcomere shortens (correct)
- Action potential travels down the T-tubules, myosin heads bind to actin filaments, calcium ions are released from the sarcoplasmic reticulum, cross-bridges form and the sarcomere shortens
- Myosin heads bind to actin filaments, calcium ions are released from the sarcoplasmic reticulum, cross-bridges form and the sarcomere shortens, action potential travels down the T-tubules
- Calcium ions are released from the sarcoplasmic reticulum, myosin heads bind to actin filaments, action potential travels down the T-tubules, cross-bridges form and the sarcomere shortens
What is the order of the cardiac conduction system?
What is the order of the cardiac conduction system?
- SA Node, Bundle of His, AV Node, Purkinje fibers
- AV Node, Bundle of His, SA Node, Purkinje fibers
- SA Node, AV Node, Bundle of His, Purkinje fibers (correct)
- AV Node, SA Node, Purkinje fibers, Bundle of His
What causes the 'dup' sound of the heart?
What causes the 'dup' sound of the heart?
- Closure of the semilunar valves (correct)
- Opening of the semilunar valves
- Opening of the atrioventricular valves
- Closure of the atrioventricular valves
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