Best 40 MCQs on Circulatory System

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The circulatory system is a marvel of nature, an intricate network of vessels and organs that keeps us alive and thriving. It’s often referred to as the body’s transportation system, but it’s so much more than that. Here’s a brief glimpse into the fascinating world of the circulatory system:

Best 40 MCQs on Circulatory System practice now

The Heart – The Body’s Engine: At the center of this system is the heart, a powerful organ about the size of your fist. It acts as a pump, tirelessly beating around 100,000 times a day to push blood throughout your body. This blood carries essential oxygen and nutrients to cells and removes waste products.

Blood Vessels – The Highways of Life: Imagine blood vessels as the highways connecting every part of your body. Arteries carry oxygen-rich blood away from the heart to nourish your tissues, while veins return oxygen-depleted blood back to the heart and lungs for a recharge. Capillaries, the tiniest vessels, enable the exchange of nutrients and oxygen between the blood and cells.

Blood – Liquid Life: Blood is a remarkable fluid. It consists of red blood cells, white blood cells, platelets, and plasma. Red blood cells are like delivery trucks, transporting oxygen. White blood cells act as the body’s defense force, fighting off infections. Platelets help with clotting to stop bleeding. Plasma is the liquid portion that carries everything around.

Circulation – A Complex Symphony: The circulatory system operates in a carefully choreographed dance. The heart contracts, pushing blood into arteries, which branch into smaller arterioles, leading to capillaries where the exchange happens. Then, veins carry the blood back to the heart, ready to be re-oxygenated. This cycle repeats endlessly, ensuring every cell gets what it needs.

Maintaining Balance – Homeostasis: One of the circulatory system’s remarkable abilities is maintaining balance or homeostasis. It adjusts blood flow and pressure as needed, whether you’re sprinting or sleeping, to meet the body’s demands.

Disease and Health: Problems with the circulatory system can lead to various health issues, from heart disease to hypertension. That’s why it’s vital to take care of your heart and blood vessels through a healthy diet, regular exercise, and lifestyle choices.

In essence, the circulatory system is a lifeline, constantly working behind the scenes to keep you alive and well. It’s a testament to the marvels of nature and a reminder to appreciate the inner workings of our bodies. So, take a moment today to thank your circulatory system for the gift of life it provides.

Best 40 MCQs on Circulatory System

Q1. How many times, a healthy person’s average heart  beats in a minute 

(a) 86 times 

(b) 98 times  

(c) 72 times 

(d) 64 times

(c) 72 times

Q2. Heart beats are caused by an electrical current that  originates in the 

(a) Brain 

(b) Blood  

(c) Heart

(d) Spinal cord

(c) Heart

Q3. Blood is  

(a) Connective tissue

(b) Epithelial tissue  

(c) Both of the above 

(d) None of the above

(a) Connective tissue

Q4. Which among the following help in circulation of  blood?

(a) Lymphocytes  

(b) Monocytes  

(c) Erithrocytes

(d) Blood platelets

(c) Erithrocytes

Q5. Which of the following statements is NOT correct about  haemoglobin?

(a) It is red coloured  

(b) It is the carrier of oxygen from lungs to the cells 

(c) It is slightly acidic

(d)  It carries carbon dioxide away from the tissues to the  lungs

((c) It is slightly acidic

Q6. The function of haemoglobin in body is  (a) Transport of Oxygen

(b)  Destruction of Bacteria  

(c)  Prevention of Anaemia 

(d)  Utilization of Iron

(a) Transport of Oxygen

Q7. Which of the following natural substances contains  iron (Fe)?

(a) Chlorophyll 

(b) Collagen

(c) Keratin 

(d) Myoglobin

(d) Myoglobin

Q8. In which of the following creatures haemoglobin is  dissolved in the plasma– 

(a) Frog 

(b) Fish  

(c) Human

(d) Earthworm

(d) Earthworm

Q9. Due to which the blood has red colour :

(a) Plasma 

(b) Haemoglobin

(c) Haemocynin 

(d) W.B.C.

(b) Haemoglobin

Q10. Average blood pressure of a human is   

(a) 60/100 

(b) 20/80  

(c) 60/140 

(d) 120/80

(d) 120/80

Q11. Which of the following instruments is used for  measuring blood pressure ?

(a) Hydrometer 

(b) Multimeter  

(c) Salinometer 

(d) Sphygmomanometer

(d) Sphygmomanometer

Q12. The blood pressure of an individual is 140 mm Hg. In  this statement, ‘Hg’ refers to 

(a) Hydrogen  

(b) Mercury

(c) Hygrometer 

(d) Heliograph

(b) Mercury

Q13. The blood pressure in our body is – 

(a)  Lesser than the atmospheric pressure 

(b)  Greater than the atmospheric pressure

(c)  Equal to the atmospheric pressure  

(d)  None of the above

(b)  Greater than the atmospheric pressure

Q14. Blood grouping was discovered by 

(a) Louis Pasteur 

(b) William Harvey  

(c) Robert Koch 

(d) Landsteiner

(d) Landsteiner

Q15. Rh factor derives its name from a type of 

(a) Ape 

(b) Human 

(c) Monkey

(d) Rat

(c) Monkey

Q16. The blood group of universal donor is (a) B 

(b) O

(c) A 

(d) AB

(b) O

Q17. If the blood group of father is A and mother is ‘O’ then  what will be the blood group of son 

(a) B 

(b) AB 

(c) O

(d) B, AB or O

(c) O

Q18. The pH value of blood in the human body is 

(a) 5.0 

(b) 6.4  

(c) 7.4

(d) 8.0

(c) 7.4

Q19. An antigen is a substance which –  (a) Lowers body temperatures  

(b) Destroys harmful bacteria  

(c) Triggers the immune system

(d) Is used as an antidote to poison

(c) Triggers the immune system

Q20. Which of the following helps us in protecting from  infection 

(a) R.B.C

(b) W.B.C

(c) Blood Plasma 

(d) Haemoglobin

(b) W.B.C

Q21. The main function of white blood cells is 

(a) Transport of oxygen  

(b) Transport of carbon dioxide  

(c) To develop resistance towards disease

(d) None of the above

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(c) To develop resistance towards disease

Q22. Antibodies are formed in blood plasma by which of  the following  

(a) Monocytes 

(b) Lymphocytes

(c) Eosinoophils 

(d) Neutrophils

(b) Lymphocytes

Q23. The viscous nature of human blood is due to  

(a) Proteins in blood

(b) Platelets in plasma  

(c) RBC and WBC in blood   

(d) All of the above

(a) Proteins in blood

Q24. The diameter of white blood corpuscles in human body  is, about :

(a) 0.007 mm

(b) 0.7 mm  

(c) 0.07 mm 

(d) 0.0007 mm

(a) 0.007 mm

Q25. In which part of our body are formed Red Blood Cells?

(a) Liver 

(b) Heart  

(c) Kidney 

(d) Bone Marrow

(d) Bone Marrow

Q26. Lymphocytes cells are formed in which part of the human body?

(a) Liver 

(b) Kidney  

(c) Pancreas 

(d) Spleen

(d) Spleen

Q27. Arteries supplying blood to the heart are called :

(a) Carotid arteries 

(b) Hepatic arteries  

(c) Coronary arteries

(d) Pulmonary arteries

(c) Coronary arteries

Q28. The enzyme which takes part in changing fibrinogen  to fibrin when blood clots are formed 

(a) Pepsin 

(b) Maltase  

(c) Thrombin

(d) Prothrombin

(c) Thrombin

Q29. Percentage of water in plasma is –  (a) 60% 

(b) 70%

(c) 80% 

(d) 90%

(d) 90%

Q30. With reference to the blood in a normal person, which  one of the following statements is correct ?

(a) Compared to arteries, veins are less numerous and  hold less of the body’s blood at any given time

(b) Blood cells constitute about 70 percent of the total  volume of the blood  

(c) White blood cells (WBC) are made by lymph nodes  only  

(d) The blood has more platelets than WBC

(d) The blood has more platelets than WBC

Q31. Which chamber of the heart pumps oxygenated blood to the rest of the body?

a) Right atrium

b) Right ventricle

c) Left atrium

d) Left ventricle

d) Left ventricle

Q32. The largest artery in the human body is:

a) Aorta

b) Pulmonary artery

c) Coronary artery

d) Carotid artery

(a) Aorta

Q33. Blood pressure is measured in:

a) Millimeters of mercury (mmHg)

b) Liters per minute (L/min)

c) Beats per minute (bpm)

d) Pascals (Pa)

a) Millimeters of mercury (mmHg)

Q34. Which blood type is considered the universal recipient?

a) A

b) B

c) AB

d) O

c) AB

Q35.Which of the following is responsible for clotting of blood?

a) White blood cells

b) Platelets

c) Red blood cells

d) Plasma

b) Platelets

Q36. The condition in which fatty deposits build up in the arteries is called:

a) Hypertension

b) Atherosclerosis

c) Anemia

d) Thrombosis

b) Atherosclerosis

Q37. Which of the following is not a major blood component?

a) Platelets

b) Plasma

c) Red blood cells

d) Hormones

d) Hormones

Q38. What is the function of the sinoatrial (SA) node in the heart?

a) Pumping blood to the body

b) Regulating heart rate

c) Carrying oxygen to the cells

d) Filtering impurities from the blood

b) Regulating heart rate

Q39. The circulatory system is also known as the:

a) Nervous system

b) Respiratory system

c) Cardiovascular system

d) Digestive system

c) Cardiovascular system

Q40. Which blood vessels carry blood away from the heart?

a) Arteries

b) Veins

c) Capillaries

d) Lymphatics

a) Arteries
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What is the circulatory system, and what is its primary function?

The circulatory system is a complex network of blood vessels, the heart, and blood. Its primary function is to transport oxygen, nutrients, hormones, and waste products throughout the body. It plays a crucial role in maintaining the body’s overall health and homeostasis.

How does blood circulation work?

Blood circulation involves the heart pumping oxygen-rich blood into arteries, which branch into smaller arterioles. From there, blood reaches tiny capillaries where oxygen and nutrients are exchanged with body tissues. Oxygen-depleted blood is then carried back through veins to the heart and lungs for reoxygenation.

What are the main components of blood, and what are their functions?

Blood consists of red blood cells (RBCs), white blood cells (WBCs), platelets, and plasma. RBCs transport oxygen, WBCs defend against infections, platelets help with clotting to prevent excessive bleeding, and plasma carries blood cells, nutrients, hormones, and waste products.

What can go wrong with the circulatory system, and what are common circulatory system disorders?

Circulatory system problems can include heart diseases like coronary artery disease and heart failure, as well as conditions like hypertension (high blood pressure), atherosclerosis (hardening of the arteries), and blood clotting disorders. These issues can impair blood flow and oxygen delivery to the body’s tissues.

How can I maintain a healthy circulatory system?

Maintaining a healthy circulatory system involves adopting a balanced diet, regular exercise, avoiding smoking, limiting alcohol intake, and managing stress. Regular check-ups with a healthcare professional can help monitor your heart health and catch potential issues early.

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