Welcome to the Circulatory System and Blood MCQs with Answers. In this post, we are sharing Circulatory System and Blood Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Circulatory System and Blood online MCQs Test.
Which chamber of the heart pumps oxygenated blood to the body?
a) Right atrium
b) Left atrium
c) Right ventricle
d) Left ventricle
What is the primary function of red blood cells?
a) Fight infections
b) Clot blood
c) Transport oxygen
d) Remove waste
Which blood vessel carries deoxygenated blood from the body to the heart?
a) Aorta
b) Pulmonary artery
c) Superior vena cava
d) Pulmonary vein
The heart is enclosed in a protective sac called the:
a) Myocardium
b) Endocardium
c) Pericardium
d) Epicardium
Which type of blood vessel carries blood away from the heart?
a) Arteries
b) Veins
c) Capillaries
d) Venules
What component of blood is responsible for clotting?
a) Red blood cells
b) White blood cells
c) Plasma
d) Platelets
Which valve is located between the left atrium and left ventricle?
a) Tricuspid valve
b) Pulmonary valve
c) Aortic valve
d) Mitral valve
Which blood type is considered the universal donor?
a) A+
b) AB+
c) O-
d) B-
What is the liquid portion of the blood called?
a) Platelets
b) Hemoglobin
c) Plasma
d) Lymph
Which of the following cells is involved in the immune response?
a) Red blood cells
b) White blood cells
c) Platelets
d) Erythrocytes
The heart’s pacemaker is located in which part of the heart?
a) AV node
b) Purkinje fibers
c) SA node
d) Bundle of His
Which blood vessel carries oxygenated blood from the lungs to the heart?
a) Pulmonary artery
b) Aorta
c) Pulmonary vein
d) Superior vena cava
What type of blood cells carry oxygen?
a) Platelets
b) Red blood cells
c) White blood cells
d) Plasma
Which protein in red blood cells binds to oxygen?
a) Fibrinogen
b) Myoglobin
c) Hemoglobin
d) Collagen
What is the main function of the circulatory system?
a) Produce hormones
b) Transport nutrients and oxygen
c) Store energy
d) Digest food
Which part of the heart separates the right and left sides?
a) Myocardium
b) Septum
c) Atrium
d) Valve
Which blood vessel is the largest artery in the body?
a) Pulmonary artery
b) Carotid artery
c) Aorta
d) Femoral artery
The process of blood cell formation occurs in the:
a) Liver
b) Bone marrow
c) Heart
d) Spleen
Which of the following is the smallest blood vessel?
a) Vein
b) Artery
c) Capillary
d) Venule
How many chambers does the human heart have?
a) 2
b) 4
c) 6
d) 3
Which blood type is considered the universal recipient?
a) A+
b) O-
c) B+
d) AB+
The right side of the heart pumps blood to the:
a) Lungs
b) Brain
c) Body
d) Kidneys
What type of blood flows through veins?
a) Oxygenated blood
b) Deoxygenated blood
c) Nutrient-rich blood
d) Plasma
Which artery supplies blood to the heart muscle itself?
a) Pulmonary artery
b) Coronary artery
c) Carotid artery
d) Femoral artery
Which blood vessels have valves to prevent backflow of blood?
a) Arteries
b) Capillaries
c) Veins
d) Venules
What is the term for the relaxation phase of the heartbeat?
a) Systole
b) Diastole
c) Cardiac cycle
d) Pacemaker
Which component of the blood helps fight infections?
a) White blood cells
b) Platelets
c) Red blood cells
d) Plasma
Which valve is located between the right atrium and right ventricle?
a) Mitral valve
b) Aortic valve
c) Tricuspid valve
d) Pulmonary valve
What is the lifespan of a typical red blood cell?
a) 120 days
b) 10 days
c) 30 days
d) 180 days
Which of the following is responsible for the red color of blood?
a) Oxygen
b) Hemoglobin
c) Carbon dioxide
d) Platelets
Which blood vessels are involved in the exchange of nutrients and waste products with tissues?
a) Veins
b) Arteries
c) Capillaries
d) Venules
The SA node is known as the:
a) Heart pump
b) Pacemaker of the heart
c) Heart valve
d) Blood flow regulator
Which component of blood carries hormones, nutrients, and waste products?
a) Plasma
b) Red blood cells
c) White blood cells
d) Platelets
The exchange of oxygen and carbon dioxide occurs in the:
a) Veins
b) Arteries
c) Capillaries
d) Heart
Which part of the heart receives deoxygenated blood from the body?
a) Left ventricle
b) Right atrium
c) Left atrium
d) Right ventricle
What is the normal pH range of human blood?
a) 6.5-7.0
b) 7.35-7.45
c) 7.8-8.0
d) 6.0-6.5
Which of the following hormones regulates red blood cell production?
a) Insulin
b) Erythropoietin
c) Thyroxine
d) Cortisol
What is the main protein found in plasma?
a) Albumin
b) Hemoglobin
c) Fibrinogen
d) Myoglobin
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