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Circulatory System and Blood MCQs with Answers

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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

Answer
d) Left ventricle

What is the primary function of red blood cells?
a) Fight infections
b) Clot blood
c) Transport oxygen
d) Remove waste

Answer
c) Transport oxygen

Which blood vessel carries deoxygenated blood from the body to the heart?
a) Aorta
b) Pulmonary artery
c) Superior vena cava
d) Pulmonary vein

Answer
c) Superior vena cava

The heart is enclosed in a protective sac called the:
a) Myocardium
b) Endocardium
c) Pericardium
d) Epicardium

Answer
c) Pericardium

Which type of blood vessel carries blood away from the heart?
a) Arteries
b) Veins
c) Capillaries
d) Venules

Answer
a) Arteries

What component of blood is responsible for clotting?
a) Red blood cells
b) White blood cells
c) Plasma
d) Platelets

Answer
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

Answer
d) Mitral valve

Which blood type is considered the universal donor?
a) A+
b) AB+
c) O-
d) B-

Answer
c) O-

What is the liquid portion of the blood called?
a) Platelets
b) Hemoglobin
c) Plasma
d) Lymph

Answer
c) Plasma

Which of the following cells is involved in the immune response?
a) Red blood cells
b) White blood cells
c) Platelets
d) Erythrocytes

Answer
b) White blood cells

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

Answer
c) SA node

Which blood vessel carries oxygenated blood from the lungs to the heart?
a) Pulmonary artery
b) Aorta
c) Pulmonary vein
d) Superior vena cava

Answer
c) Pulmonary vein

What type of blood cells carry oxygen?
a) Platelets
b) Red blood cells
c) White blood cells
d) Plasma

Answer
b) Red blood cells

Which protein in red blood cells binds to oxygen?
a) Fibrinogen
b) Myoglobin
c) Hemoglobin
d) Collagen

Answer
c) Hemoglobin

What is the main function of the circulatory system?
a) Produce hormones
b) Transport nutrients and oxygen
c) Store energy
d) Digest food

Answer
b) Transport nutrients and oxygen

Which part of the heart separates the right and left sides?
a) Myocardium
b) Septum
c) Atrium
d) Valve

Answer
b) Septum

Which blood vessel is the largest artery in the body?
a) Pulmonary artery
b) Carotid artery
c) Aorta
d) Femoral artery

Answer
c) Aorta

The process of blood cell formation occurs in the:
a) Liver
b) Bone marrow
c) Heart
d) Spleen

Answer
b) Bone marrow

Which of the following is the smallest blood vessel?
a) Vein
b) Artery
c) Capillary
d) Venule

Answer
c) Capillary

How many chambers does the human heart have?
a) 2
b) 4
c) 6
d) 3

Answer
b) 4

Which blood type is considered the universal recipient?
a) A+
b) O-
c) B+
d) AB+

Answer
d) AB+

The right side of the heart pumps blood to the:
a) Lungs
b) Brain
c) Body
d) Kidneys

Answer
a) Lungs

What type of blood flows through veins?
a) Oxygenated blood
b) Deoxygenated blood
c) Nutrient-rich blood
d) Plasma

Answer
b) Deoxygenated blood

Which artery supplies blood to the heart muscle itself?
a) Pulmonary artery
b) Coronary artery
c) Carotid artery
d) Femoral artery

Answer
b) Coronary artery

Which blood vessels have valves to prevent backflow of blood?
a) Arteries
b) Capillaries
c) Veins
d) Venules

Answer
c) Veins

What is the term for the relaxation phase of the heartbeat?
a) Systole
b) Diastole
c) Cardiac cycle
d) Pacemaker

Answer
b) Diastole

Which component of the blood helps fight infections?
a) White blood cells
b) Platelets
c) Red blood cells
d) Plasma

Answer
a) White blood cells

Which valve is located between the right atrium and right ventricle?
a) Mitral valve
b) Aortic valve
c) Tricuspid valve
d) Pulmonary valve

Answer
c) Tricuspid valve

What is the lifespan of a typical red blood cell?
a) 120 days
b) 10 days
c) 30 days
d) 180 days

Answer
a) 120 days

Which of the following is responsible for the red color of blood?
a) Oxygen
b) Hemoglobin
c) Carbon dioxide
d) Platelets

Answer
b) Hemoglobin

Which blood vessels are involved in the exchange of nutrients and waste products with tissues?
a) Veins
b) Arteries
c) Capillaries
d) Venules

Answer
c) Capillaries

The SA node is known as the:
a) Heart pump
b) Pacemaker of the heart
c) Heart valve
d) Blood flow regulator

Answer
b) Pacemaker of the heart

Which component of blood carries hormones, nutrients, and waste products?
a) Plasma
b) Red blood cells
c) White blood cells
d) Platelets

Answer
a) Plasma

The exchange of oxygen and carbon dioxide occurs in the:
a) Veins
b) Arteries
c) Capillaries
d) Heart

Answer
c) Capillaries

Which part of the heart receives deoxygenated blood from the body?
a) Left ventricle
b) Right atrium
c) Left atrium
d) Right ventricle

Answer
b) Right atrium

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

Answer
b) 7.35-7.45

Which of the following hormones regulates red blood cell production?
a) Insulin
b) Erythropoietin
c) Thyroxine
d) Cortisol

Answer
b) Erythropoietin

What is the main protein found in plasma?
a) Albumin
b) Hemoglobin
c) Fibrinogen
d) Myoglobin

Answer
a) Albumin

If you are interested to enhance your knowledge regarding PhysicsChemistryComputer, and Biology please click on the link of each category, you will be redirected to dedicated website for each category.

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