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Body Fluids and Circulation Test - 13

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Body Fluids and Circulation Test - 13
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which statement is incorrect?
    Solution
    Mast cells and basophils are major cells in the early phases of immediate hypersensitivity reactions. Mast cell is very similar to basophils in functions. Both are granulated cells, that contain heparin and histamine, which are anticoagulant. So, option A is correct. Mast cells are long lived cells, while basophils are short lived (compared to mast cells). So, option B is correct. Mast cells are fixed in tissues, while the basophils circulate in blood. So, option D is correct. Mast cells are bigger than basophils. They are 10uM in size and have round nuclei. So, option C is incorrect.
    Thus, the correct answer is option (C), 'Mast cells are smaller than basophils with a bilobed nucleus'.
  • Question 2
    1 / -0
    Statements-

    1. Carbonic anhydrase is present in the erythrocytes.

    2. In erythrocytes the carbon dioxide combine with water and is transported.

    Solution
    The correct option is A.
    Carbonic anhydrase, enzyme found in red blood cells catalyzes the interconversion of carbon dioxide (CO2) and carbonic acid (H2CO3). Carbonic anhydrase plays an important role in respiration by influencing CO2 transport in the blood.
  • Question 3
    1 / -0
    Pace maker of the heart is

    Solution
    S.A node called as pacemaker ,node of keith and  flack heart , brain of heart ,pulsation centre. 
  • Question 4
    1 / -0
    Hepatic portal system collects blood from the _____________.
    Solution
    The hepatic portal system is the part of the blood circulatory system of vertebrates in which blood from the digestive tract is taken through capillaries & veins and transported to the liver before its transport to the heart.
    This part of the circulatory system is called the hepatic portal system.
    Hence the correct option is D.
  • Question 5
    1 / -0
    Which of the following substances, if introduced into the blood stream, cause coagulation of blood at the site of its introduction?
    Solution
    Correct option: D

    Explanation:
    • If introduced into the blood stream, Thromboplastin (plasma protein) causes blood coagulation, by converting prothrombin to thrombin at the site of its introduction. It is also called thrombokinase.
    • Fibrinogen is a glycoprotein which aids in formation of blood clots. 
    • Prothrombin is an essential component of blood clotting mechanism.
    • Heparin is the glycosaminoglycan, which prevents blood clotting. 
      Thus, Option D is correct.
  • Question 6
    1 / -0
    Which of the following work as phagocytes?
    Solution
    • White blood cells or WBCs are the cells of the immune system, that are involved in defending the body against infections. There are different types of WBCs such as eosinophils, neutrophils, lymphocytes, monocytes etc. 
    Here, certain cells like monocytes are involved in the process of phagocytosis.
    • Red blood cells or RBCs are the cells that are the principal means of delivering oxygen.
    • Enzymes are macromolecular biological catalysts.
    • The hormone is the class of signalling molecule produced by glands that are transported to various organs by the circulatory system to regulate physiology and behaviour.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Mark the odd one from the following.
    Solution
    Monocytes are a type of WBCs. Monocytes mature in different types of macrophages.
    Lymphocytes are B- cells or T- cells and they have receptors on their surface and are able to bind antigens and thus help the foreign substance to get removed from the body.
    Neutrophils are the most abundant type of WBCs. They are phagocytic in nature and are able to engulf foreign substances.
    Erythrocytes are red blood cells, that are involved in delivering the oxygen to various tissues.
    So, the first three are WBCs that are involved in the immune system, as they help in eliminating various antigens, while the latter is not involved in the immune response.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Blood does not clot inside the blood vessels due to the presence of
    Solution
    Liver produces an anticoagulant, hetero-polysaccharide called heparin which prevent clotting inside the blood vessels. Heparin is a highly sulfated glycosaminoglycan and is also used to form an inner anticoagulant surface on experimental and medical devices.
    Fibrinogen is a glycoprotein that helps in the formation of blood clots.
    Thrombin is a blood coagulation factor.
    Thus, the correct answer is option A. 
  • Question 9
    1 / -0
    In the extrinsic clotting pathway, the active factor VII activates which factors?
    Solution
    When there is damage to the blood vessel, the factor VII leaves the circulation and comes in contact with the tissue factor (TF), which is expressed on tissue-factor bearing cells, forming an activated TF - FVIIa. This TF - FVIIa activates factor IX and factor X. Thus, the correct answer is the option (C).
  • Question 10
    1 / -0
    Squeezing of leucocytes out from the endothelium of capillaries to fight foreign agents is known as
    Solution
    • Haemolysis is the destruction of red blood cells so that the haemoglobin is freed into the surrounding medium.
    • Diapedesis is the migration of blood cells, especially WBCs (leucocytes), through the intact walls of blood vessels into the surrounding tissue to fight foreign agents.
    • Phagocytosis is the process by which phagocytes ingest or engulf other cells or particles.
    • Rouleaux are stacks or aggregations of RBCs, which form because of the unique discoid shape of the cells.
    Thus, the correct answer is option B.
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