#1
Which chamber of the heart receives oxygen-depleted blood from the body?
Left atrium
Right atrium
Left ventricle
Right ventricle
#2
Which of the following blood vessels carries oxygenated blood from the lungs to the heart?
Pulmonary artery
Pulmonary vein
Aorta
Inferior vena cava
#3
Capillaries are the site of:
Oxygen and carbon dioxide exchange
Blood storage
Heartbeat initiation
Blood filtration
#4
In the context of blood vessels, which type has the thinnest walls and is responsible for nutrient and gas exchange?
Veins
Arteries
Capillaries
Venules
#5
The QRS complex on an electrocardiogram (ECG) represents:
Atrial depolarization
Ventricular depolarization
Ventricular repolarization
Atrial repolarization
#6
What is the primary function of the atrioventricular (AV) node in the heart?
To pump blood through the body
To oxygenate the blood
To delay the transmission of electrical impulses to the ventricles
To generate the initial electrical impulse
#7
The cardiac output is defined as the volume of blood pumped by the heart per minute. Which formula correctly represents cardiac output?
Heart rate x Stroke volume
Stroke volume / Heart rate
Heart rate + Stroke volume
Heart rate - Stroke volume
#8
What is the term for the contraction phase of the cardiac cycle when the heart muscle is pumping blood?
Diastole
Systole
Atrial repolarization
Ventricular relaxation
#9
Which valve separates the left atrium from the left ventricle in the heart?
Aortic valve
Tricuspid valve
Pulmonary valve
Mitral valve
#10
Which of the following structures is involved in the electrical conduction system of the heart?
Saphenous vein
Bundle of His
Great saphenous vein
Coronary sinus
#11
Which layer of the heart wall is responsible for its pumping action?
Epicardium
Myocardium
Endocardium
Pericardium
#12
What is the primary function of the sinoatrial (SA) node in the heart?
To regulate blood pressure
To filter impurities from the blood
To generate the electrical impulses that initiate the heartbeat
To store oxygen in the myocardium
#13
Which blood vessel is responsible for supplying oxygenated blood to the heart muscle itself?
Coronary sinus
Pulmonary artery
Coronary artery
Superior vena cava
#14
In the context of blood pressure, what does the term 'systolic' represent?
The pressure during heart relaxation
The pressure during heart contraction
The pressure in the atria
The pressure in the ventricles
#15
The preload of the heart refers to:
The pressure generated in the ventricles at the end of diastole
The volume of blood in the ventricles at the end of diastole
The resistance the heart must overcome to eject blood
The amount of blood pumped by the heart per minute