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Body Fluids and Circulation Test - 69

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Body Fluids and Circulation Test - 69
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  • Question 1
    1 / -0
     WBCs are produced in which organ? 
    Solution
    WBCs or leukocytes are majorly produced in the red bone marrow while a small amount is produced in the yellow bone marrow.
    So, the correct answer is 'Bone marrow'
  • Question 2
    1 / -0
    Which of the following is responsible for coagulation of blood? 
    Solution
    • The platelets also called thrombocytes are round in shape and the smallest in size. 
    • The platelets help in clotting of blood which prevents excessive blood loss and direct entry of disease causing germs into the blood through cuts and wounds.
    • Thus, these are responsible for coagulation of blood. Option C is correct.
  • Question 3
    1 / -0
    The thinnest blood vessels in the human body are..
    Solution
    The thinnest blood vessels in the human body are capillaries that intervene  the organs and reach the tissues. They facilitate exchange of gases between the cells of the tissue and the blood cells. They have the smallest diameter among all the blood vessels and are single cell in thickness.
    So, the correct answer is 'Capillaries'
  • Question 4
    1 / -0
    The cardiac impulse is initiated and conduct further upto ventricle. The correct sequence of conduction of impulse is
    A)SA NodeAV NodePurkinje fiber
    		A V Bundle
    B)SA NodePurkinje fiberAV NodeA V Bundle
    C)SA NodeAV NodeA V BundlePurkinje fiber
    D)SA NodePurkinje fiberA V BundleAV Node
  • Question 5
    1 / -0
    At high altitude, Red blood cells 
    Solution
    At high altitudes, the number of RBCs increases to compensate for the decrease in the level of atmospheric Oxygen.
  • Question 6
    1 / -0
    If the heart sound recording and ECG recordings are superimposed then the first heart sound would occur
    Solution
    The QRS complex represents ventricular depolarisation, i.e., the start of ventricular contraction. Ventricular contraction causes the atrioventricular valves (i.e., the mitral and tricuspid valves) to close, producing the first heart sound. Therefore, the QRS complex of the ECG precedes the first heart sound slightly.
    So, the correct answer is 'Just after the QRS complex'
  • Question 7
    1 / -0
    The most abundant tissue of the adenoid tonsils is
    Solution
    The tonsils are small, rounded masses of lymphoid tissue located in the lamina propria of the pharyngeal wall.
    Lymphoid tissue of the tonsils is made up of free cells, with a rich framework of reticular type III collagen fibres supporting the cells. These fibres are maintained by reticular cells.
    So, the correct answer is option B.
  • Question 8
    1 / -0
    You are required to draw blood from a patient and keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for this purpose?
    Solution

    Correct option : (C)

    Explanation for correct statement:

    • Calcium plays a very important role in blood clotting by converting prothrombin into thrombin.
    • The presence of calcium will remove heparin (blood anti-coagulant) and will promote blood clotting. 

      Explanation for incorrect statements:

    • Heparin and sodium oxalate are natural anticoagulant agents which do not promote blood to clot.
    • Chilled test tube can also clot the blood due to low temperature.

  • Question 9
    1 / -0
    The portal system seen in all vertebrates is
    Solution
    The system which directs the blood from the gastrointestinal tract to the liver before entering the heart is known as portal system. It starts and end with the capillaries.
    The portal system of liver is known as hepatic portal system. It carries the nutrient rich blood from the visceral parts to the liver for processing. Liver removes the toxic substances from the blood. 
    The portal system in the kidney is known as renal portal system. It is formed by the union of femoral and sciatic nerve. It opens into the kidney by capillaries. Kidney removes the metabolic waste from the blood of the portal system.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    In a typical heart, if EDV is 120ml of blood and ESV is 50ml of blend, the stroke volume (SV) is
    Solution
    The amount of blood moved from the left ventricles of the heart is called stroke volume (SV). SV can be measured by subtracting end-diastolic volume (EDV) with end-systolic volume (ESV) i.e, SV = EDV - ESV, which is 120-50. Result 70ml is the stroke volume.
    So, the correct answer is option A.
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