#1
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
Right atrium
Left ventricle
Right ventricle
#2
What is the primary function of the cardiovascular system?
Digestion
Transport of nutrients
Gas exchange
Circulation of blood
#3
Which blood vessel returns deoxygenated blood to the right atrium of the heart?
Pulmonary artery
Pulmonary vein
Aorta
Inferior vena cava
#4
What is the primary function of the left ventricle in the heart?
Receive deoxygenated blood from the body
Pump oxygenated blood to the lungs
Pump oxygenated blood to the body
Receive oxygenated blood from the lungs
#5
Which of the following statements about blood pressure is correct?
Systolic pressure is the lower number
Diastolic pressure represents the contraction phase of the heart
Normal blood pressure is considered to be 140/80 mm Hg
Hypertension is defined as consistently low blood pressure
#6
What is the normal range of heart rate for adults at rest?
60-100 beats per minute
100-150 beats per minute
40-60 beats per minute
150-200 beats per minute
#7
Which wave on an electrocardiogram represents atrial depolarization?
#8
Which blood vessel carries oxygenated blood from the heart to the body tissues?
Pulmonary artery
Pulmonary vein
Aorta
Superior vena cava
#9
What is the primary role of the sinoatrial (SA) node in the heart?
Conduction of impulses to the ventricles
Initiation of the heartbeat
Regulation of blood pressure
Conduction of impulses to the atria
#10
What is the function of the mitral valve in the heart?
Prevent backflow of blood from the left ventricle to the left atrium
Control blood flow from the right atrium to the right ventricle
Connect the pulmonary artery to the aorta
Initiate the heartbeat
#11
In an electrocardiogram, what does the PR interval represent?
Atrial depolarization
Ventricular depolarization
Conduction time from atria to ventricles
Ventricular repolarization
#12
In a standard 12-lead ECG, where are the limb leads placed?
On the chest
On the arms and legs
On the forehead
On the back
#13
What is the primary role of the atrioventricular (AV) node in the heart?
Initiation of the heartbeat
Conduction of impulses to the ventricles
Regulation of blood pressure
Conduction of impulses to the atria
#14
What is the function of the coronary arteries?
Carry deoxygenated blood to the heart muscle
Supply oxygenated blood to the heart muscle
Connect the heart to the lungs
Conduct electrical signals in the heart
#15
Which valve is located between the right atrium and the right ventricle in the heart?
Mitral valve
Tricuspid valve
Aortic valve
Pulmonary valve
#16
What does the term 'ST segment' in an ECG represent?
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
Atrial depolarization
#17
In cardiac physiology, what is the function of the Purkinje fibers?
Conduct electrical signals to the atria
Conduct electrical signals to the ventricles
Initiate the heartbeat
Regulate blood pressure
#18
Which of the following conditions is characterized by a rapid, irregular heartbeat?
Bradycardia
Tachycardia
Arrhythmia
Fibrillation
#19
What is the significance of the QRS complex in an electrocardiogram?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#20
What condition is characterized by the accumulation of fatty deposits on artery walls?
Atherosclerosis
Hypertension
Angina pectoris
Myocardial infarction
#21
Which of the following is not a major component of blood?
Plasma
Red blood cells
Platelets
Insulin
#22
Which of the following is a risk factor for cardiovascular disease?
High-density lipoprotein (HDL) cholesterol
Low blood pressure
Regular physical activity
Smoking
#23
What is the function of the chordae tendineae in the heart?
Initiate the heartbeat
Prevent backflow of blood into the atria
Conduct electrical signals to the ventricles
Regulate blood pressure
#24
What is the term for the volume of blood pumped out by each ventricle in one minute?
Cardiac output
Stroke volume
End-diastolic volume
Ejection fraction
#25
Which of the following is a symptom of a myocardial infarction (heart attack)?
Persistent cough
Chest pain or discomfort
Joint pain
Blurred vision