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Questions and Answers
Which part of the cardiac muscle is responsible for storing and releasing calcium ions (Ca2+) for excitation-contraction coupling?
Which part of the cardiac muscle is responsible for storing and releasing calcium ions (Ca2+) for excitation-contraction coupling?
- Sarcoplasmic reticulum (SR) (correct)
- Mitochondria
- T-tubules
- Thick filaments
Where are T-tubules located in the cardiac muscle?
Where are T-tubules located in the cardiac muscle?
- In the ventricles
- In the atria
- Close to the contractile elements
- At the Z lines (correct)
What is the main component of the thick filaments in cardiac muscle?
What is the main component of the thick filaments in cardiac muscle?
- F-actin
- Tropomyosin
- Meromyosin/myosin (correct)
- Troponin (C, I, T)
Which property of muscle cells allows them to respond to stimuli and initiate an action potential?
Which property of muscle cells allows them to respond to stimuli and initiate an action potential?
What term refers to the ability of certain cells, like the sinoatrial node, to initiate their own electrical activity?
What term refers to the ability of certain cells, like the sinoatrial node, to initiate their own electrical activity?
Which property of muscle cells enables them to generate force and shorten?
Which property of muscle cells enables them to generate force and shorten?
Which type of cardiac cells exhibit slow response action potentials?
Which type of cardiac cells exhibit slow response action potentials?
Which phase of the cardiac action potential is characterized by rapid upstroke?
Which phase of the cardiac action potential is characterized by rapid upstroke?
Where is the intrinsic pacemaker of the heart located?
Where is the intrinsic pacemaker of the heart located?
During which phase of the cardiac action potential does potassium ion (K+) efflux cause early repolarization?
During which phase of the cardiac action potential does potassium ion (K+) efflux cause early repolarization?
What is the primary ion responsible for the depolarization phase (phase 0) of the SA node action potential?
What is the primary ion responsible for the depolarization phase (phase 0) of the SA node action potential?
What causes the repolarization in phase 3 of the cardiac action potential?
What causes the repolarization in phase 3 of the cardiac action potential?
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