Circulatory System MCQs – Part I | Chapter-wise Objective Questions with Answers for All Competitive Government Exams

RBCs do not perform aerobic respiration because they do not contain –
(a) Mitochondria
(b) Nucleus
(c) Endoplasmic reticulum
(d) Lysosomes
Ans: (a)

Main function of white blood corpuscles is –
(a) Transport of CO₂
(b) Transport of oxygen
(c) To produce immune system of body
(d) None of these
Ans: (c)
The largest white blood corpuscle is –
(a) Lymphocyte
(b) Monocyte
(c) Thrombocyte
(d) Erythrocyte
Ans: (b)

At high altitude, RBCs in human blood –
(a) Increase in number
(b) Decrease in number
(c) Decrease in size
(d) Increase in size
Ans: (a)
Red colour of blood is due to presence of –
(a) Plasma
(b) Haemoglobin
(c) RBC
(d) WBC
Ans: (b)
Metal present in blood is –
(a) Calcium
(b) Zinc
(c) Sodium
(d) Iron
Ans: (d)

Old and worn-out red blood corpuscles are destroyed in –
(a) Bone marrow
(b) Spleen
(c) Liver
(d) Stomach
Ans: (b)
Function of haemoglobin is –
(a) To transport oxygen
(b) Destruction of bacteria
(c) To check the loss of blood
(d) None of these
Ans: (a)
Match List-I with List-II and choose the correct code –
A. RBC → 2. Oxygenation
B. Neutrophils → 1. Immunity
C. Eosinophils → 4. Mechanism of allergy
D. Platelets → 3. Clotting
(a) 3 4 1 2
(b) 3 1 4 2
(c) 2 1 4 3
(d) 2 4 1 3
Ans: (c)

The blood groups were discovered by –
(a) Altmann
(b) Landsteiner
(c) Losch
(d) Ronald Ross
Ans: (b)
Universal donors are people with the blood group –
(a) A
(b) B
(c) O
(d) AB
Ans: (c)
A person with ‘AB’ blood group is sometimes called a universal recipient because of the –
(a) Lack of antigen in his blood
(b) Lack of antibodies in his blood
(c) Lack of both antigen and antibodies
(d) Presence of antibodies in his blood
Ans: (b)

What happens if a person receives the wrong type of blood?
(a) All the arteries constrict
(b) All the arteries dilate
(c) The RBCs agglutinate
(d) Spleen and lymph nodes deteriorate
Ans: (c)

Which organ of the body never rests?
(a) Eyes
(b) Pancreas
(c) Liver
(d) Heart
Ans: (d)
The right portion of human heart receives ____ blood –
(a) Pure
(b) Impure
(c) Mixed
(d) None of these
Ans: (b)

Which among the following carries impure blood to the human heart?
(a) Aorta
(b) Pulmonary vein
(c) Pulmonary arteries
(d) Vena Cava
Ans: (c)
Arteries supplying blood to the heart are called –
(a) Carotid arteries
(b) Hepatic arteries
(c) Coronary arteries
(d) Pulmonary arteries
Ans: (c)
Function of pace maker is –
(a) To regulate urine formation
(b) To regulate digestion
(c) To initiate heart beat
(d) To start respiration
Ans: (c)

Pace maker is related with –
(a) Kidney
(b) Brain
(c) Lung
(d) Heart
Ans: (d)
The sound “lub-dub” is produced by –
(a) Liver
(b) Kidney
(c) Heart
(d) Lungs
Ans: (c)
In a healthy person, rate of heartbeat in one minute is –
(a) 1 sec
(b) 1 minute
(c) 1.5 sec
(d) 0.8 sec
Ans: (d)

Which of the following is correlated with blood pressure?
(a) Liver
(b) Testis
(c) Pancreas
(d) Adrenal
Ans: (d)
If the radius of blood vessels decreases, the blood pressure will –
(a) Increase
(b) Decrease
(c) Remain unaffected
(d) Increase for males and decrease for females
Ans: (a)
Which of the following statements is correct about blood in a normal person?
(a) Veins are less numerous than arteries
(b) Blood cells constitute about 70% of blood volume
(c) WBCs are made by lymph nodes
(d) Blood has more platelets than WBCs
Ans: (d)

In which organ are lymphocytes formed?
(a) Liver
(b) Long bone
(c) Pancreas
(d) Spleen
Ans: (d)
Fluid part of blood devoid of corpuscles is called –
(a) Tissue fluid
(b) Plasma
(c) Serum
(d) Lymph
Ans: (c)
Animals with open circulatory system possess –
(a) Coelenteron
(b) Spongocoel
(c) Pseudocoel
(d) Haemocoel
Ans: (d)