#1
Which of the following is NOT a component of the circulatory system?
Liver
ExplanationLiver is not part of the circulatory system; it is an organ involved in digestion and detoxification.
#2
What is the main function of red blood cells?
Carry oxygen to body tissues
ExplanationRed blood cells transport oxygen to body tissues for cellular respiration.
#3
What is the average heart rate of a resting adult?
60-80 beats per minute
ExplanationA resting adult typically has a heart rate between 60-80 beats per minute.
#4
Which of the following is NOT a type of blood vessel?
Alveolus
ExplanationAlveolus is not a blood vessel; it is a structure found in the lungs involved in gas exchange.
#5
Which blood type is considered the universal donor?
O
ExplanationBlood type O is considered the universal donor as it can be transfused to recipients of any blood type.
#6
Which blood vessels carry blood away from the heart?
Arteries
ExplanationArteries carry oxygenated blood away from the heart to various parts of the body.
#7
What is the name of the valve between the left atrium and the left ventricle?
Mitral valve
ExplanationThe mitral valve regulates blood flow between the left atrium and the left ventricle.
#8
What is the purpose of the lymphatic system in relation to the circulatory system?
Fighting infection
ExplanationThe lymphatic system aids the circulatory system by combating infections and removing excess fluids.
#9
Which of the following is a function of platelets in the circulatory system?
Clotting blood
ExplanationPlatelets play a crucial role in blood clotting, preventing excessive bleeding.
#10
What is the term for the phase of the cardiac cycle when the heart is relaxed and filling with blood?
Diastole
ExplanationDiastole is the phase of the cardiac cycle when the heart relaxes, allowing chambers to fill with blood.
#11
Which of the following is the primary pacemaker of the heart?
Sinoatrial node (SA node)
ExplanationThe SA node generates electrical impulses, setting the pace for heartbeats.
#12
What is the term for the volume of blood pumped by each ventricle per minute?
Cardiac output
ExplanationCardiac output refers to the volume of blood ejected by each ventricle per minute, reflecting heart efficiency.
#13
What is the term for the process by which white blood cells engulf and destroy foreign particles?
Phagocytosis
ExplanationPhagocytosis is the process by which white blood cells ingest and eliminate foreign particles, aiding in immune defense.
#14
Which of the following is NOT a component of blood?
Antibodies
ExplanationAntibodies are proteins in the immune system; they are not components of blood but are carried within it.
#15
What is the term for the process of blood clot formation?
Coagulation
ExplanationCoagulation is the process of blood clot formation, crucial for preventing excessive bleeding and promoting wound healing.