#1
Which chamber of the heart receives oxygenated blood from the lungs?
Right atrium
Left atrium
Right ventricle
Left ventricle
#2
What is the average resting heart rate for adults?
60-80 beats per minute
90-110 beats per minute
120-140 beats per minute
150-170 beats per minute
#3
What is the term for the volume of blood ejected by the left ventricle in one contraction?
Stroke volume
Cardiac output
End-diastolic volume
Preload
#4
What is the main function of the atrioventricular (AV) valves in the heart?
Preventing backflow of blood into the atria
Regulating blood pressure
Initiating the heartbeat
Pumping blood to the lungs
#5
What is the primary function of the coronary arteries?
Regulating blood pressure
Supplying oxygen and nutrients to the heart muscle
Pumping blood to the lungs
Preventing backflow of blood into the atria
#6
What is the main function of the heart valves?
To regulate blood pressure
To prevent backflow of blood
To produce red blood cells
To filter impurities from the blood
#7
Which vessel carries oxygenated blood away from the heart to the rest of the body?
Pulmonary artery
Pulmonary vein
Aorta
Superior vena cava
#8
Which coronary artery is often referred to as the 'widowmaker'?
Left anterior descending (LAD) artery
Right coronary artery (RCA)
Left circumflex artery (LCx)
Posterior descending artery (PDA)
#9
During which phase of the cardiac cycle do the heart chambers fill with blood?
Atrial systole
Atrial diastole
Ventricular systole
Ventricular diastole
#10
Which layer of the heart wall is responsible for muscle contraction and pumping blood?
Endocardium
Myocardium
Pericardium
Epicardium
#11
What is the primary function of the sinoatrial (SA) node in the heart?
Conduction of electrical impulses
Pumping blood to the lungs
Initiating the heartbeat
Regulating blood pressure
#12
What is the term for the contraction phase of the cardiac cycle?
Systole
Diastole
Ejection
Refilling
#13
Which part of the heart's conduction system initiates the heartbeat?
Atrioventricular (AV) node
Sinoatrial (SA) node
Purkinje fibers
Bundle of His
#14
What is the purpose of the pericardium?
To regulate blood pressure
To protect the heart from infection
To provide oxygen to the heart muscle
To store excess blood
#15
Which cardiac valve is located between the left atrium and left ventricle?
Tricuspid valve
Bicuspid valve (mitral valve)
Pulmonary valve
Aortic valve
#16
Which vessel returns deoxygenated blood to the right atrium of the heart?
Pulmonary vein
Aorta
Superior vena cava
Pulmonary artery
#17
In which phase of the cardiac cycle do the ventricles relax and fill with blood?
Atrial systole
Atrial diastole
Ventricular systole
Ventricular diastole