#1
Which chamber of the heart receives oxygen-rich blood from the lungs?
Left atrium
ExplanationReceives oxygen-rich blood from the lungs.
#2
What is the main function of heart valves?
To control the flow of blood through the heart
ExplanationControls blood flow through the heart.
#3
Which vessel carries oxygen-rich blood away from the heart to the body?
Aorta
ExplanationCarries oxygen-rich blood to the body.
#4
What is the approximate number of chambers in the human heart?
Four
ExplanationNumber of heart chambers.
#5
Which of the following is responsible for the lub-dub sound of the heart?
Closing of the atrioventricular valves
ExplanationSource of lub-dub heart sound.
#6
Which structure separates the right and left sides of the heart?
Interventricular septum
ExplanationSeparates heart chambers.
#7
Which of the following is the pacemaker of the heart?
Sinoatrial (SA) node
ExplanationActs as the heart's pacemaker.
#8
Which chamber of the heart pumps blood to the lungs for oxygenation?
Right ventricle
ExplanationPumps blood to the lungs.
#9
Which heart chamber pumps oxygenated blood to the rest of the body?
Left ventricle
ExplanationPumps oxygenated blood to body.
#10
What is the function of the atrioventricular (AV) valves in the heart?
Prevent blood from flowing back into the atria during ventricular contraction
ExplanationPrevents blood backflow during contraction.
#11
The pulmonary artery carries blood from the heart to which organ?
Lungs
ExplanationCarries blood to the lungs.
#12
What is the correct order of the cardiac conduction system?
SA node, AV node, Bundle of His, Purkinje fibers
ExplanationSequence of electrical signals in the heart.
#13
Which of the following is NOT a component of the pericardium?
Myocardium
ExplanationNot a component of pericardium.
#14
What is the function of the chordae tendineae in the heart?
To anchor the heart valves and prevent them from inverting
ExplanationAnchors and prevents valve inversion.
#15
What is the medical term for a heart attack?
Myocardial infarction
ExplanationMedical term for heart attack.
#16
Which of the following is responsible for initiating the heartbeat?
Sinoatrial (SA) node
ExplanationInitiates heartbeats.
#17
What is the function of the coronary arteries?
Carry oxygenated blood to the heart muscle
ExplanationSupplies oxygenated blood to heart.
#18
Which blood vessel carries deoxygenated blood from the body back to the heart?
Vena cava
ExplanationReturns deoxygenated blood to heart.
#19
Which blood vessel carries oxygenated blood from the lungs to the heart?
Pulmonary vein
ExplanationReturns oxygenated blood from lungs.
#20
What is the purpose of the purkinje fibers in the heart?
To conduct electrical signals to the ventricles
ExplanationConducts electrical signals to ventricles.
#21
Which of the following is NOT a risk factor for heart disease?
Low cholesterol levels
ExplanationNot a risk factor for heart disease.
#22
Which of the following is NOT a coronary artery?
Pulmonary artery
ExplanationNot a coronary artery.
#23
What is the term for the thick layer of muscle in the heart responsible for pumping blood?
Myocardium
ExplanationMuscle layer pumping blood.
#24
What is the role of the papillary muscles in the heart?
Stabilize the position of the heart valves
ExplanationStabilizes heart valve position.
#25
Which heart valve separates the left atrium from the left ventricle?
Mitral valve
ExplanationSeparates left atrium and ventricle.