Podcast
Questions and Answers
Which layer of the heart wall is responsible for the smooth inner surface of the heart?
Which layer of the heart wall is responsible for the smooth inner surface of the heart?
- Epicardium
- Myocardium
- Purkinje fibers
- Endocardium (correct)
Which component of the cardiac conduction system is responsible for initiating the heart's rhythmic contractions?
Which component of the cardiac conduction system is responsible for initiating the heart's rhythmic contractions?
- Atrioventricular node
- Atrioventricular bundle
- Purkinje fibers
- Sinoatrial node (correct)
What is the primary mechanism responsible for the generation of action potentials in cardiac muscle cells?
What is the primary mechanism responsible for the generation of action potentials in cardiac muscle cells?
- Spontaneous depolarization of the cell membrane
- Contraction of the ventricular wall
- Changes in membrane permeability to sodium and potassium ions (correct)
- Stimulation from the sympathetic nervous system
How do the action potentials in cardiac muscle differ from those in skeletal muscle?
How do the action potentials in cardiac muscle differ from those in skeletal muscle?
What is the primary function of the atrioventricular (AV) node in the cardiac conduction system?
What is the primary function of the atrioventricular (AV) node in the cardiac conduction system?
What is the role of the Purkinje fibers in the cardiac conduction system?
What is the role of the Purkinje fibers in the cardiac conduction system?
Which of the following accurately describes the sequence of events during a cardiac cycle?
Which of the following accurately describes the sequence of events during a cardiac cycle?
Which of the following statements about cardiac muscle cells is incorrect?
Which of the following statements about cardiac muscle cells is incorrect?
Which of the following structures is responsible for initiating the contraction of atrial muscle cells?
Which of the following structures is responsible for initiating the contraction of atrial muscle cells?
Which coronary artery supplies blood to the left ventricle?
Which coronary artery supplies blood to the left ventricle?
What is the function of intercalated disks in cardiac muscle cells?
What is the function of intercalated disks in cardiac muscle cells?
Which of the following vessels drains blood from the cardiac muscle?
Which of the following vessels drains blood from the cardiac muscle?
Where does the action potential originate in the heart?
Where does the action potential originate in the heart?
Which component of the heart's conduction system is responsible for slowly spreading action potentials?
Which component of the heart's conduction system is responsible for slowly spreading action potentials?
Where are Purkinje fibers located in the heart?
Where are Purkinje fibers located in the heart?
What function do Purkinje fibers serve in the heart's conduction system?
What function do Purkinje fibers serve in the heart's conduction system?
Which part of the heart functions as the pacemaker due to a large number of Ca2+ channels?
Which part of the heart functions as the pacemaker due to a large number of Ca2+ channels?
What is responsible for recording electrical events in the heart and diagnosing cardiac abnormalities?
What is responsible for recording electrical events in the heart and diagnosing cardiac abnormalities?
