#1
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
ExplanationReceives oxygen-rich blood from the pulmonary veins.
#2
What is the primary function of the cardiovascular system?
Circulation of blood
ExplanationTransporting nutrients, oxygen, and waste products throughout the body.
#3
Which blood vessel returns deoxygenated blood to the right atrium of the heart?
Inferior vena cava
ExplanationCarries deoxygenated blood from lower body to heart.
#4
What is the primary function of the left ventricle in the heart?
Pump oxygenated blood to the body
ExplanationEjects oxygen-rich blood into systemic circulation.
#5
Which of the following statements about blood pressure is correct?
Normal blood pressure is considered to be 140/80 mm Hg
ExplanationTypical range for systolic over diastolic pressure in adults.
#6
What is the normal range of heart rate for adults at rest?
60-100 beats per minute
ExplanationHealthy heart rate range during rest.
#7
Which wave on an electrocardiogram represents atrial depolarization?
P wave
ExplanationRepresents atrial contraction.
#8
Which blood vessel carries oxygenated blood from the heart to the body tissues?
Aorta
ExplanationMain artery distributing oxygen-rich blood.
#9
What is the primary role of the sinoatrial (SA) node in the heart?
Initiation of the heartbeat
ExplanationNatural pacemaker, initiates heart contractions.
#10
What is the function of the mitral valve in the heart?
Prevent backflow of blood from the left ventricle to the left atrium
ExplanationEnsures one-way flow from atrium to ventricle.
#11
In an electrocardiogram, what does the PR interval represent?
Conduction time from atria to ventricles
ExplanationTime taken for electrical impulse to travel from atria to ventricles.
#12
What does the term 'ST segment' in an ECG represent?
Ventricular repolarization
ExplanationTime between ventricular depolarization and repolarization.
#13
In cardiac physiology, what is the function of the Purkinje fibers?
Conduct electrical signals to the ventricles
ExplanationTransmit impulses, causing ventricular contraction.
#14
Which of the following conditions is characterized by a rapid, irregular heartbeat?
Tachycardia
ExplanationAbnormally fast heart rhythm.
#15
What is the significance of the QRS complex in an electrocardiogram?
Ventricular depolarization
ExplanationRepresents ventricular contraction.
#16
What condition is characterized by the accumulation of fatty deposits on artery walls?
Atherosclerosis
ExplanationBuildup of plaque, narrowing arteries.
#17
Which of the following is not a major component of blood?
Insulin
ExplanationHormone involved in glucose metabolism, not a blood component.