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Circulatory System and Blood Online MCQs with Answers
Which of the following is NOT a function of the circulatory system?
a) Transporting oxygen and nutrients
b) Removing waste products
c) Regulating body temperature
d) Producing red blood cells
The heart is divided into how many chambers?
a) 2
b) 3
c) 4
d) 5
The largest artery in the human body is the:
a) Pulmonary artery
b) Aorta
c) Carotid artery
d) Coronary artery
Which of the following is NOT a component of blood?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The process by which blood cells are formed is called:
a) Hemostasis
b) Hemolysis
c) Hematopoiesis
d) Hemoglobin synthesis
Which of the following blood vessels carries oxygenated blood from the lungs to the heart?
a) Pulmonary artery
b) Pulmonary vein
c) Aorta
d) Vena cava
The process of blood clotting is known as:
a) Hemostasis
b) Hemolysis
c) Hematopoiesis
d) Hemoglobin synthesis
The iron-containing protein in red blood cells that carries oxygen is called:
a) Hemoglobin
b) Myoglobin
c) Collagen
d) Fibrinogen
The smallest blood vessels in the body are called:
a) Veins
b) Arteries
c) Capillaries
d) Venules
Which of the following blood types is considered the universal recipient?
a) A
b) B
c) AB
d) O
The liquid part of blood is called:
a) Plasma
b) Serum
c) Lymph
d) Erythrocytes
The process by which white blood cells engulf and destroy foreign substances is called:
a) Phagocytosis
b) Hemostasis
c) Hemolysis
d) Hematopoiesis
Which of the following is responsible for carrying deoxygenated blood back to the heart?
a) Pulmonary artery
b) Pulmonary vein
c) Aorta
d) Vena cava
The condition characterized by a deficiency of red blood cells or hemoglobin is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombosis
The pacemaker of the heart is located in the:
a) Right atrium
b) Left atrium
c) Right ventricle
d) Left ventricle
Which of the following is NOT a type of white blood cell?
a) Neutrophil
b) Lymphocyte
c) Monocyte
d) Erythrocyte
The condition characterized by high blood pressure is known as:
a) Hypotension
b) Hypertension
c) Hypoglycemia
d) Hyperglycemia
The process by which oxygen is exchanged for carbon dioxide in the lungs is called:
a) Ventilation
b) Respiration
c) Diffusion
d) Excretion
The valve that separates the left atrium and left ventricle of the heart is the:
a) Aortic valve
b) Pulmonary valve
c) Tricuspid valve
d) Mitral valve
The condition characterized by the formation of fatty plaques in the arteries is known as:
a) Atherosclerosis
b) Thrombosis
c) Embolism
d) Ischemia
The process by which blood vessels constrict to reduce blood flow is called:
a) Vasodilation
b) Vasoconstriction
c) Angiogenesis
d) Hemostasis
Which of the following is responsible for initiating the electrical signals that regulate the heartbeat?
a) Atrioventricular node (AV node)
b) Sinoatrial node (SA node)
c) Bundle of His
d) Purkinje fibers
The condition characterized by the formation of blood clots in the deep veins of the legs is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Deep vein thrombosis (DVT)
The process by which blood vessels dilate to increase blood flow is called:
a) Vasodilation
b) Vasoconstriction
c) Angiogenesis
d) Hemostasis
Which of the following is responsible for initiating the clotting process in response to an injury?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The process by which blood is pumped out of the heart is called:
a) Systole
b) Diastole
c) Vasodilation
d) Vasoconstriction
Which blood vessels carry blood back to the heart?
a) Arteries
b) Veins
c) Capillaries
d) Venules
The condition characterized by a rapid, irregular heartbeat is known as:
a) Bradycardia
b) Tachycardia
c) Arrhythmia
d) Aneurysm
Which of the following blood types is considered the universal donor?
a) A
b) B
c) AB
d) O
The process by which blood vessels repair and regenerate after an injury is called:
a) Vasodilation
b) Vasoconstriction
c) Angiogenesis
d) Hemostasis
Which of the following is responsible for transporting oxygen from the lungs to the body tissues?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The first blood vessels to receive oxygenated blood from the heart are the:
a) Arteries
b) Veins
c) Capillaries
d) Venules
The condition characterized by the formation of blood clots within the blood vessels is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombosis
The valve that separates the right atrium and right ventricle of the heart is the:
a) Aortic valve
b) Pulmonary valve
c) Tricuspid valve
d) Mitral valve
The condition characterized by low blood pressure is known as:
a) Hypotension
b) Hypertension
c) Hypoglycemia
d) Hyperglycemia
Which of the following is responsible for carrying oxygen from the lungs to the body tissues?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The process by which blood vessels leak fluid into the surrounding tissues is called:
a) Hemostasis
b) Hemolysis
c) Inflammation
d) Diffusion
Which of the following is responsible for the transport of nutrients, hormones, and waste products in the blood?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by a deficiency in clotting factors in the blood is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombosis
The process by which blood vessels expand and contract to regulate blood flow is called:
a) Vasodilation
b) Vasoconstriction
c) Angiogenesis
d) Hemostasis
Which of the following is responsible for defending the body against infections and foreign substances?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by a buildup of fatty deposits on the inner walls of the arteries is known as:
a) Atherosclerosis
b) Thrombosis
c) Embolism
d) Ischemia
The process by which blood vessels relax and widen to increase blood flow is called:
a) Vasodilation
b) Vasoconstriction
c) Angiogenesis
d) Hemostasis
Which of the following is responsible for the formation of blood clots to prevent excessive bleeding?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by the enlargement or ballooning of an artery is known as:
a) Bradycardia
b) Tachycardia
c) Aneurysm
d) Arrhythmia
Which of the following is responsible for the transport of oxygen and carbon dioxide in the blood?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by an abnormal increase in the number of white blood cells is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombosis
The valve that prevents the backflow of blood from the aorta into the left ventricle is the:
a) Aortic valve
b) Pulmonary valve
c) Tricuspid valve
d) Mitral valve
The condition characterized by the obstruction of a blood vessel by a blood clot is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Embolism
Which of the following is responsible for the production of antibodies and the immune response?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by the inability of blood to clot properly is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombosis
The process by which oxygen is transported from the bloodstream into body tissues is called:
a) Ventilation
b) Respiration
c) Diffusion
d) Excretion
Which of the following is responsible for the prevention of backflow of blood from the ventricles to the atria?
a) Atrioventricular node (AV node)
b) Sinoatrial node (SA node)
c) Bundle of His
d) Purkinje fibers
The condition characterized by the formation of blood clots in the coronary arteries is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Coronary thrombosis
Which of the following is responsible for the transport of nutrients, hormones, and waste products in the blood?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by the formation of blood clots within the deep veins of the lower limbs is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Deep vein thrombosis (DVT)
Which of the following is responsible for the transport of oxygen from the lungs to body tissues and carbon dioxide from body tissues to the lungs?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
The condition characterized by a deficiency of platelets in the blood is known as:
a) Anemia
b) Leukemia
c) Hemophilia
d) Thrombocytopenia
The process by which blood cells are destroyed and removed from the bloodstream is called:
a) Hemostasis
b) Hemolysis
c) Hematopoiesis
d) Hemoglobin synthesis
Which of the following is responsible for the prevention of backflow of blood from the pulmonary arteries to the right ventricle?
a) Aortic valve
b) Pulmonary valve
c) Tricuspid valve
d) Mitral valve