23 Questions
What is the primary event that occurs during the QRS complex?
Ventricular depolarization
What is the term for the volume of blood in each ventricle at the end of ventricular diastole?
End diastolic volume
During which phase of the cardiac cycle do the atria relax and ventricles begin to contract?
Ventricular systole
What is the term for the abnormal heart sounds that are often indicative of valve problems?
Heart murmurs
What is the sequence of electrical events that occurs during a normal heartbeat?
P wave, QRS complex, T wave
During which phase of the cardiac cycle do the AV valves close and the SL valves open?
Ejection phase
What is the primary function of the atrioventricular bundle?
To serve as the only electrical connection between the atria and ventricles
What is the primary mechanism by which autorhythmic cells depolarize?
Through the slow opening of Na⁺ channels
What is the effect of the cardioacceleratory center on the heart?
It increases the heart rate by stimulating the sympathetic neurons
What is the purpose of the Purkinje fibers in the heart?
To complete the pathway of electrical conduction into the ventricular walls
What is the term for the sequence of electrical events in the heart?
Sequence of excitation
What is the mechanism by which the heart rate is modified?
Through the influence of the autonomic nervous system
What is the primary function of the fibrous skeleton of the heart?
To limit the spread of action potentials to specific pathways
During the cardiac cycle, which valve opens during ventricular relaxation?
Pulmonary semilunar valve
What is the term for the sequence of events that occurs in the cardiac cycle, including the contraction and relaxation of the heart muscle?
Cardiac cycle
Which of the following is NOT a function of the coronary circulation?
Supply of blood to the lungs
What is the name of the valve that separates the right atrium and ventricle?
Tricuspid valve
What is the term for the network of cells that initiate and distribute impulses to coordinate the depolarization and contraction of the heart?
Intrinsic cardiac conduction system
What is the primary function of the endocardium?
To provide a simple squamous epithelial lining to the heart chambers
What is the sequence of blood flow through the heart?
Right atrium → tricuspid valve → right ventricle → pulmonary semilunar valve → pulmonary trunk → pulmonary arteries → lungs
What is the purpose of the chordae tendineae?
To support the flaps of the atrioventricular valves during ventricular contraction
What is the term for the two-side-by-side pumps of the heart?
Right and left pumps
What type of muscle cells are found in the myocardium?
Spiral bundles of cardiac muscle cells
Understand the sequence of excitation in the heart, including the roles of the SA node, AV node, and AV bundle. Learn how these components work together to regulate the heartbeat. Test your knowledge of heart physiology with this quiz.
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