#1
Which chamber of the heart receives deoxygenated blood from the body?
Right atrium
ExplanationDeoxygenated blood enters the right atrium before being pumped to the lungs.
#2
What is the primary function of the cardiovascular system?
To deliver oxygen and nutrients to cells
ExplanationThe cardiovascular system transports oxygen and nutrients to body cells for their metabolic needs.
#3
Which of the following is NOT a major type of blood vessel in the body?
Lymphatic vessel
ExplanationLymphatic vessels carry lymph, not blood.
#4
What is the approximate resting heart rate for a healthy adult?
60-80 beats per minute
ExplanationA normal resting heart rate for adults ranges from 60 to 80 beats per minute.
#5
Which blood vessel carries oxygenated blood from the lungs to the heart?
Pulmonary vein
ExplanationThe pulmonary vein carries oxygen-rich blood from the lungs to the heart.
#6
What is the term for the widening of blood vessels?
Vasodilation
ExplanationVasodilation refers to the widening of blood vessels, which leads to decreased blood pressure.
#7
Which blood vessel carries oxygenated blood away from the heart to the body?
Aorta
ExplanationThe aorta distributes oxygenated blood to the body's tissues.
#8
What is the role of valves in the cardiovascular system?
To prevent backflow of blood
ExplanationValves ensure blood flows in one direction, preventing backward flow.
#9
What is the pacemaker of the heart?
Sinoatrial (SA) node
ExplanationThe SA node sets the rhythm and rate of heartbeats.
#10
Which of the following factors can increase blood pressure?
Increased sodium intake
ExplanationHigher sodium intake can lead to fluid retention and elevated blood pressure.
#11
What is the term for the contraction phase of the cardiac cycle?
Systole
ExplanationSystole refers to the heart's contraction, pushing blood out of its chambers.
#12
What is the term for a blockage in a blood vessel that interrupts blood flow to the heart muscle?
Myocardial infarction
ExplanationA myocardial infarction, commonly known as a heart attack, occurs when blood flow to a part of the heart is blocked.
#13
Which of the following is responsible for the lub-dub sound of the heart?
Opening and closing of the semilunar valves
ExplanationThe 'lub-dub' sound of the heart is caused by the closure of heart valves during the cardiac cycle.
#14
What is the term for a rapid and irregular heart rhythm?
Fibrillation
ExplanationFibrillation is a chaotic, irregular heartbeat, often rapid and inefficient for pumping blood.
#15
Which of the following factors can contribute to the development of hypertension?
Obesity
ExplanationObesity increases the risk of hypertension by putting strain on the cardiovascular system.
#16
What is the term for the volume of blood ejected from the heart in one contraction?
Stroke volume
ExplanationStroke volume is the amount of blood pumped by the heart with each beat.
#17
Which layer of the heart wall is responsible for pumping blood?
Myocardium
ExplanationThe myocardium, the heart's muscular layer, contracts to pump blood.
#18
What is the main function of the lymphatic system in relation to the cardiovascular system?
To remove excess fluid and waste products from tissues
ExplanationThe lymphatic system assists the cardiovascular system by draining excess fluid and waste products from tissues.
#19
Which of the following is responsible for carrying deoxygenated blood to the lungs for oxygenation?
Pulmonary artery
ExplanationThe pulmonary artery transports deoxygenated blood from the heart to the lungs for oxygenation.
#20
What is the Frank-Starling law of the heart?
It describes the relationship between stroke volume and end-diastolic volume
ExplanationThis law states that the more the heart muscle is stretched during filling, the greater the force of contraction and the greater the quantity of blood pumped into circulation.