#1
Which chamber of the heart receives deoxygenated blood from the body?
Left atrium
Right atrium
Left ventricle
Right ventricle
#2
Which valve prevents the backflow of blood from the right ventricle into the right atrium?
Tricuspid valve
Pulmonary valve
Aortic valve
Mitral valve
#3
Which blood vessel carries oxygenated blood away from the heart to the rest of the body?
Pulmonary artery
Pulmonary vein
Aorta
Superior vena cava
#4
What is the function of the septum in the heart?
To regulate blood pressure
To separate the atria from the ventricles
To prevent the backflow of blood
To supply nutrients to the heart muscle
#5
Which of the following statements about the right side of the heart is true?
It pumps oxygenated blood to the body
It receives oxygenated blood from the body
It pumps deoxygenated blood to the lungs
It receives deoxygenated blood from the lungs
#6
What is the role of the papillary muscles in the heart?
To prevent backflow of blood into the atria
To contract and close the atrioventricular valves
To anchor the heart valves and prevent them from inverting
To regulate the flow of blood between the chambers
#7
The coronary arteries are responsible for supplying blood to which part of the heart?
Muscular walls of the ventricles
The sinoatrial (SA) node
The coronary sinus
The heart valves
#8
Which of the following is NOT a layer of the heart wall?
Epicardium
Myocardium
Endocardium
Pericardium
#9
Which part of the conduction system in the heart is responsible for initiating the heartbeat?
Bundle of His
Purkinje fibers
Sinoatrial (SA) node
Atrioventricular (AV) node
#10
What happens during ventricular systole?
The atria contract and push blood into the ventricles
The ventricles relax and fill with blood
The ventricles contract and pump blood out of the heart
The heart valves open to allow blood flow
#11
Which artery supplies blood to the right atrium and sinoatrial (SA) node?
Left coronary artery
Right coronary artery
Marginal artery
Circumflex artery
#12
During which phase of the cardiac cycle does ventricular filling occur?
Isovolumetric contraction
Ventricular ejection
Ventricular diastole
Ventricular systole
#13
The 'Lub-Dub' sound of the heartbeat is associated with which event?
Atrial contraction
Opening of the semilunar valves
Ventricular relaxation
Closure of the heart valves
#14
What is the approximate resting heart rate of an average adult?
60-80 beats per minute
90-120 beats per minute
30-40 beats per minute
150-180 beats per minute
#15
What is the function of the chordae tendineae?
To regulate blood flow between the atria and ventricles
To anchor the heart valves and prevent them from inverting
To conduct electrical impulses between the heart chambers
To strengthen the walls of the heart chambers
#16
What is the term for the relaxation phase of the cardiac cycle?
Isovolumetric contraction
Ventricular ejection
Ventricular diastole
Ventricular systole
#17
Which of the following hormones is NOT involved in regulating heart function?
Epinephrine
Insulin
Aldosterone
Norepinephrine