Heart And Circulatory System (Part-I)

Total Questions: 32

11. Who discovered blood circulation? [S.S.C. Online C.H.S.L. (T-I) 5.08.2021 (Shift-II) S.S.C. Online MTS (T-I) 5.01.2017 (Shift-III)]

(a) David Baltimore
(b) Rosalind Franklin
(c) William Harvey
(d) Charles Darwin

Correct Answer: (c) William Harvey

Solution:William Harvey was the first person to describe the circulation of blood in the body. He showed that arteries and veins form a complete circuit. The circuit starts at the heart and leads back to the heart. The heart's regular contractions drive the flow of blood throughout the whole body.

12. Blood group was discovered by _____ . [S.S.C. Online Graduate Level (T-I) 6.09.2016 (Shift-II) S.S.C. Online MTS (T-I) 4.01.2017 (Shift-I)]

(a) Alexander Fleming
(b) William Harvey
(c) Landsteiner
(d) Pavlov

Correct Answer: (c) Landsteiner

Solution:Blood group was discovered by Landsteiner. Karl Landsteiner, an Austrian physician, identified the ABO blood group system in 1900, a groundbreaking discovery that revolutionized blood transfusions and laid the foundation for modern blood banking.

13. In 1930, which scientist was awarded the Nobel Prize for describing the human ABO blood group system? [S.S.C. Online CHSL (T-I) 13.01.2020 (Shift-I)]

(a) Karl Landsteiner
(b) George Wald
(c) Albert Claude
(d) Roger Guillemin

Correct Answer: (a) Karl Landsteiner

Solution:In 1930, Landsteiner was awarded the Nobel Prize for his description of the human ABO blood group system, which he himself considered an accidental discovery. Karl Landsteiner discovered human blood groups in 1900 and laid the foundation for the modern medical practice of blood transfusion.

14. Blood group AB has— [S.S.C. Online Graduate Level (T-I) 10.09.2016 (Shift-II)]

(a) No antigen
(b) No antibody
(c) Neither antigen nor antibody
(d) Both antigen and antibody

Correct Answer: (b) No antibody

Solution:White blood cells protect the body against infection. As your immune system recognizes the difference between your own blood and the invading cells, it produces antibodies to block and remove foreign cells.

15. What is the main purpose of leukocytes? [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-III)]

(a) to carry infection
(b) to carry nutrients
(c) to carry oxygen
(d) to carry immune response

Correct Answer: (d) to carry immune response

Solution:The main purpose of leukocytes (white blood cells) is to carry immune response. Leukocytes are a crucial part of the immune system, identifying and destroying pathogens, abnormal cells, and foreign substances to protect the body from infection and disease.

16. Which cells in our body are popularly called "soldiers of the human body"? [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-II)]

(a) White Blood Cells
(b) Basophils
(c) Red Blood Cells
(d) Eosinophils

Correct Answer: (a) White Blood Cells

Solution:White Blood Cells are popularly called "soldiers of the human body". This is because they are the primary components of the immune system, tirelessly working to identify, attack, and eliminate foreign invaders like bacteria, viruses, and other harmful pathogens.

17. Which component of blood fights against germs that enter the human body? [S.S.C. Online MTS (T-I) 9.08.2019 (Shift-II)]

(a) Hemoglobin
(b) Red blood cells
(c) Platelets
(d) White blood cells

Correct Answer: (d) White blood cells

Solution:White blood cells are the component of blood that fights against germs that enter the human body. These specialized cells of the immune system detect and destroy infectious agents, playing a vital role in defending the body from disease.

18. ‘Leukopenia’ is an abnormal— [S.S.C. Online CHSL (T-I) 16.01.2020 (Shift-III)]

(a) increase in red blood cells
(b) decrease in white blood cells
(c) decrease in red blood cells
(d) decrease in white blood cells

Correct Answer: (b) decrease in white blood cells

Solution:'Leukopenia’ is an abnormal decrease in white blood cells. It refers to a lower-than-normal white blood cell count, which can weaken the immune system and increase the risk of infections.

19. Lymph, a light clear fluid made up of white blood cells, attacks harmful _______ in the blood. [S.S.C. Online CGL (T-I) 13.08.2021 (Shift-II)]

(a) Bacteria
(b) Protozoa
(c) Fungi
(d) Viruses

Correct Answer: (a) Bacteria

Solution:Lymph, a light clear fluid made up of white blood cells, attacks harmful Bacteria in the blood. Lymph contains lymphocytes, a type of white blood cell, which are critical for recognizing and combating various pathogens, including bacteria, viruses, and fungi, as part of the immune response.

20. The largest artery in the human body is _____ . [S.S.C. Online Graduate Level (T-1) 2.09.2016 (Shift-1)]

(a) Aorta
(b) Capillary
(c) Vena cava
(d) Pulmonary vein

Correct Answer: (a) Aorta

Solution:The largest artery is the aorta, the main high-pressure pipeline connected to the heart's left ventricle. The aorta branches into a network of smaller arteries that extend throughout the body. The arteries' smaller branches are called arterioles and capillaries. The pulmonary arteries carry oxygen-poor blood from the heart to the lungs under low pressure, making these arteries unique.

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