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Body Fluids and Circulation Test - 8

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Body Fluids and Circulation Test - 8
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  • Question 1
    1 / -0
    The blood circulation in human heart is called ____________.
    Solution
    The blood circulation in the human heart is called double circulation because the blood passes through the heart twice in one complete cycle of the body. Once through the right half in the form of deoxygenated blood and once through the left half in the form of oxygenated blood. 
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Oxygenated blood returns from lungs to the heart through
    Solution
    Veins are the blood vessels that carry blood to the heart. Pulmonary veins are responsible for carrying oxygenated blood from the lungs to the left atrium of the heart. 
    Humans have four of these veins in total, two from each lung. 
    There are two right pulmonary veins, known as the right superior and right inferior veins. These carry blood from the right lung. The fact that these veins carry oxygenated blood makes them different from all other human veins, as they are used to carry deoxygenated blood.
  • Question 3
    1 / -0
    Antigen-A and antibody-B are present in which blood group:
    Solution
    Blood group A has A-antigens on the red blood cells with anti-B antibodies in the plasma. This combination of antigens and antibodies determine which blood type can be safely transfused for medical purposes.
    So, the correct answer is 'Blood group A'.
  • Question 4
    1 / -0
    Iron $$\left(Fe\right)$$ ions are present in 
    Solution
    Haemoglobin (Hb) is the iron-containing protein present in the RBCs of all vertebrates. RBCs get their red color because of the presence of haemoglobin. It is made up of four subunits of polypeptides, or globins, which are chains of amino acids - 2 alpha chains and 2 beta chains in adult Hb. The main function of hemoglobin is to transport oxygen from the lungs to the tissues and then transport CO$$_2$$ back from the tissues to the lungs. Hence, option D is correct.
  • Question 5
    1 / -0
    Thromboplastin required in blood clotting is secreted by
    Solution
    Thromboplastin is a protein secreted by platelets at the site of injury during wound. It converts plasma protein prothrombin into thrombin in the presence of calcium ions. In the presence of thrombin, fibrinogen gets converted into fibrin which leads to the formation of a clot forming a type of plug
    So, the correct answer is 'Platelets'
  • Question 6
    1 / -0
    Vitamin needed for blood coagulation is
    Solution
    Vitamin K is essential for clotting as it is required for the formation of prothrombin in the liver. Prothrombin is an important plasma protein which gets converted into thrombin which is one of the steps in blood clotting process. Thrombin converts plasma protein fibrinogen into fibrin which ultimately forms a clot
    So, the correct answer is 'K' 
  • Question 7
    1 / -0
    Coronary artery supplies blood to
    Solution
    The human heart is richly supplied with oxygen. A special coronary system of blood vessels is present in our body exclusively for the circulation of blood to and from the cardiac musculature. Coronary artery supplies blood to the heart.
  • Question 8
    1 / -0
    A clot of blood contains
    Solution
    When blood vessels are cut or damaged, the loss of blood from the system must be stopped before shock and possible death occur. This is accomplished by solidification of the blood, a process called coagulation or clotting. A blood clot consists of a plug of platelets and network of insoluble fibrin molecules. It does not contains thrombin, fibrinogen and prothrombin.
    So, correct answer is 'Fibrin'
  • Question 9
    1 / -0
    Cells which lose their nucleus during differentiation are 
    Solution
    Erythrocytes are red blood cells, that are involved in delivering oxygen to various tissues. In humans, these becomes anuclated as they get mature for providing more space for hemoglobin.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    The process of blood clotting does not require
    Solution
    Blood clotting is the process by which blood changes from liquid to gel and stop bleeding. When the blood vessels get injured, platelets in blood produces prothrombin in the presence of vitamin K. The prothrombin then converts into the thrombin (active form) in the presence of thrombokinase and calcium ions. This thrombin then converts fibrinogen (inactive) into the fibrin (active). Fibrin thread then plugs the damaged part and appear like a clot. Thus, the correct answer is option A.
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