#1
Which chamber of the heart receives deoxygenated blood from the body?
Right atrium
ExplanationReceives deoxygenated blood from the body
#2
Which valve prevents the backflow of blood from the right ventricle into the right atrium?
Tricuspid valve
ExplanationPrevents backflow into the right atrium
#3
Which blood vessel carries oxygenated blood away from the heart to the rest of the body?
Aorta
ExplanationCarries oxygenated blood away from heart
#4
What is the function of the septum in the heart?
To separate the atria from the ventricles
ExplanationSeparates atria from ventricles
#5
Which of the following statements about the right side of the heart is true?
It receives deoxygenated blood from the lungs
ExplanationReceives deoxygenated blood from the lungs
#6
What is the role of the papillary muscles in the heart?
To anchor the heart valves and prevent them from inverting
ExplanationAnchors heart valves
#7
Which of the following structures is NOT part of the heart's electrical conduction system?
Chordae tendineae
ExplanationNot part of conduction system
#8
Which chamber of the heart has the thickest muscular walls?
Left ventricle
ExplanationLeft ventricle has thickest walls
#9
Which of the following blood vessels carries deoxygenated blood?
Pulmonary artery
ExplanationCarries deoxygenated blood
#10
What is the function of the pericardium?
To provide lubrication and protection to the heart
ExplanationProvides lubrication and protection
#11
The coronary arteries are responsible for supplying blood to which part of the heart?
Muscular walls of the ventricles
ExplanationSupply blood to ventricular walls
#12
Which of the following is NOT a layer of the heart wall?
Pericardium
ExplanationNot a part of heart wall layers
#13
Which part of the conduction system in the heart is responsible for initiating the heartbeat?
Sinoatrial (SA) node
ExplanationInitiates heartbeat
#14
What happens during ventricular systole?
The ventricles contract and pump blood out of the heart
ExplanationVentricles contract, pumping blood
#15
Which artery supplies blood to the right atrium and sinoatrial (SA) node?
Right coronary artery
ExplanationSupplies blood to right atrium and SA node
#16
During which phase of the cardiac cycle does ventricular filling occur?
Ventricular diastole
ExplanationVentricles fill during diastole
#17
What is the primary function of heart valves?
To prevent the backflow of blood
ExplanationPrevent blood backflow
#18
Which coronary artery supplies blood to the left atrium and left ventricle?
Circumflex artery
ExplanationSupplies blood to left atrium and ventricle
#19
Which valve separates the left atrium from the left ventricle?
Mitral valve
ExplanationSeparates left atrium and ventricle
#20
What is the term for the volume of blood ejected by each ventricle in one minute?
Cardiac output
ExplanationVolume of blood ejected per minute
#21
The 'Lub-Dub' sound of the heartbeat is associated with which event?
Closure of the heart valves
ExplanationAssociated with valve closure
#22
What is the approximate resting heart rate of an average adult?
60-80 beats per minute
ExplanationApproximate adult resting heart rate
#23
What is the function of the chordae tendineae?
To anchor the heart valves and prevent them from inverting
ExplanationAnchors heart valves
#24
What is the term for the relaxation phase of the cardiac cycle?
Ventricular diastole
ExplanationRelaxation phase
#25
Which of the following hormones is NOT involved in regulating heart function?
Insulin
ExplanationNot involved in heart regulation