#1
In which phase of the cardiac cycle does the ventricular filling occur?
Systole
Diastole
Isovolumetric contraction
Isovolumetric relaxation
#2
Which chamber of the heart initiates the electrical impulse that leads to the cardiac cycle?
Left atrium
Right atrium
Left ventricle
Right ventricle
#3
Which phase of the cardiac cycle is characterized by both atria and ventricles in diastole?
Atrial systole
Ventricular systole
Atrial diastole
Ventricular diastole
#4
What event marks the end of ventricular systole during the cardiac cycle?
Aortic valve closure
Aortic valve opening
Mitral valve closure
Mitral valve opening
#5
What is the primary role of the atria during the ventricular ejection phase of the cardiac cycle?
Contract forcefully
Relax completely
Aid in ventricular filling
Generate blood pressure
#6
What is the function of the atrioventricular valves during the cardiac cycle?
Prevent backflow of blood into the atria
Prevent backflow of blood into the ventricles
Facilitate the opening of semilunar valves
Regulate blood pressure
#7
During which phase of the cardiac cycle does the aortic valve open?
Ventricular filling
Isovolumetric contraction
Ventricular ejection
Isovolumetric relaxation
#8
During the cardiac cycle, what is the primary role of the semilunar valves?
Prevent backflow into the atria
Prevent backflow into the ventricles
Regulate blood pressure
Facilitate atrial contraction
#9
What is the term for the volume of blood ejected from the left ventricle in one contraction?
Stroke volume
End-diastolic volume
Cardiac output
Preload
#10
What is the primary factor determining the onset of the isovolumetric contraction phase?
Atrial contraction
Aortic valve closure
Ventricular depolarization
Ventricular filling
#11
What is the primary determinant of stroke volume during the cardiac cycle?
Heart rate
Preload
Afterload
Contractility
#12
In the cardiac cycle, what event occurs during the isovolumetric contraction phase?
Aortic valve closes
Aortic valve opens
Ventricular pressure decreases
Ventricular volume remains constant
#13
During the cardiac cycle, what event occurs during the isovolumetric relaxation phase?
Aortic valve opens
Ventricular filling
Aortic valve closes
Ventricular pressure decreases
#14
What is the primary factor affecting the duration of the cardiac cycle?
Heart rate
Blood viscosity
Ventricular contractility
Atrial pressure
#15
What is the term for the volume of blood in the ventricle at the end of diastole, just before ventricular contraction?
Stroke volume
End-diastolic volume
Cardiac output
Preload