Podcast
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?
Where are T-tubules located in the cardiac muscle?
Where are T-tubules located in the cardiac muscle?
What is the main component of the thick filaments in cardiac muscle?
What is the main component of the thick filaments in cardiac muscle?
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?
Signup and view all the answers
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?
Signup and view all the answers
Which property of muscle cells enables them to generate force and shorten?
Which property of muscle cells enables them to generate force and shorten?
Signup and view all the answers
Which type of cardiac cells exhibit slow response action potentials?
Which type of cardiac cells exhibit slow response action potentials?
Signup and view all the answers
Which phase of the cardiac action potential is characterized by rapid upstroke?
Which phase of the cardiac action potential is characterized by rapid upstroke?
Signup and view all the answers
Where is the intrinsic pacemaker of the heart located?
Where is the intrinsic pacemaker of the heart located?
Signup and view all the answers
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?
Signup and view all the answers
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?
Signup and view all the answers
What causes the repolarization in phase 3 of the cardiac action potential?
What causes the repolarization in phase 3 of the cardiac action potential?
Signup and view all the answers