#1
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
ExplanationReceives oxygen-rich blood from the lungs.
#2
What is the main function of the cardiovascular system?
Transporting oxygen to the cells
ExplanationPrimary role is to deliver oxygen to body tissues.
#3
Which of the following is NOT a component of blood?
Lymphocytes
ExplanationWhite blood cells involved in immune response.
#4
Which of the following is NOT a major blood vessel connected to the heart?
Carotid artery
ExplanationSupplies blood to brain, not directly connected to heart.
#5
Which of the following is NOT a type of blood vessel?
Alveolus
ExplanationAlveolus is a small air sac in the lungs.
#6
Which of the following is NOT a risk factor for cardiovascular disease?
Regular exercise
ExplanationRegular exercise is beneficial for heart health.
#7
Which blood vessel carries deoxygenated blood away from the heart?
Pulmonary artery
ExplanationCarries blood from heart to lungs for oxygenation.
#8
What is the pacemaker of the heart called?
SA node
ExplanationInitiates heartbeat, located in right atrium.
#9
What is the term for the network of vessels that drains excess fluid from tissues and returns it to the bloodstream?
Lymphatic system
ExplanationMaintains fluid balance, immune function.
#10
Which valve prevents the backflow of blood from the left ventricle into the left atrium?
Mitral valve
ExplanationControls blood flow between left atrium and ventricle.
#11
What is the term for the process of blood clot formation?
Thrombosis
ExplanationFormation of blood clots within blood vessels.
#12
What is the term for the volume of blood pumped by the heart in one minute?
Cardiac output
ExplanationAmount of blood heart pumps per minute.
#13
What is the term for the force exerted by blood against the walls of blood vessels?
Blood pressure
ExplanationPressure exerted by circulating blood.
#14
What is the term for the process of blood cell formation?
Hematopoiesis
ExplanationProduction of blood cells in bone marrow.
#15
What is the term for the process by which blood vessels constrict to decrease blood flow?
Vasoconstriction
ExplanationNarrowing of blood vessels.
#16
Which of the following is the largest artery in the human body?
Aorta
ExplanationMain artery carrying oxygen-rich blood from heart.
#17
Which part of the brain regulates heart rate and blood pressure?
Medulla oblongata
ExplanationControls involuntary functions like heart rate.
#18
Which of the following statements about blood types is correct?
Type O- is the universal donor
ExplanationBlood type without A or B antigens, compatible with all.