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Breathing and Exchange of Gases Test 49

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Breathing and Exchange of Gases Test 49
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  • Question 1
    1 / -0
    It is known that exposure to carbon monoxide is harmful to animals because
    Solution
    Carbon monoxide poisoning occurs after enough inhalation of carbon monoxide (CO). Carbon monoxide binds with haemoglobin to form carboxyhaemoglobin because of which oxygen is not released to the tissues.
  • Question 2
    1 / -0
    The oxygen - haemoglobin dissociation curve will show a right shift in case of
    Solution
    An increase in [pCO2][pCO_2], [H+][H^+], and temperature, can lead to the right shift of the oxygen-haemoglobin dissociation curve. The increase in [pCO2][pCO_2], [H+][H^+] causes a decrement in the pH which leads to the change in oxygen-haemoglobin binding.
    So, the correct answer is (A)
  • Question 3
    1 / -0
    Direction: Refer to the given graph and select the correct options for the questions that follow.

    Blood can combine with almost______of oxygen if the hemoglobin is 100 percent saturated.

    Solution
    In accordance with the graph given in the question, when and if the haemoglobin is 100 per cent saturated, blood can combine with almost 20 mL of oxygen.
    So, the correct answer is '20 mL'.
  • Question 4
    1 / -0
    Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of
    Solution

    Correct option: D

    Explanation:

    Hemoglobin is RBC which has red pigment which transports oxygen.

    O2 + Hb – it forms oxyhemoglobin

    CO2 + Hb – it forms carbaminohemoglobin

    CO + Hb – it forms carboxyhemoglobin

    When CO increases (incomplete oxidation of carbon form CO).

    Hence, ‘carbon monoxide’ is correct answer.

     

  • Question 5
    1 / -0
    Mark the incorrect statement in context to O2O_{2} binding to Hb. 
    Solution
    None of the options is correct): Oxygen dissociation curve is highly useful in studying the effect of factors like pCO2CO_{2}, H+ concentration, etc., on binding of O2O_{2} with haemoglobin, In the alveoli, where there is high pO2O_{2}, low pCO2CO_{2}, high pH and lower temperature, the factors are'all favourable for the formation of oxyhaemoglobin.
  • Question 6
    1 / -0
    Where does exchange of gases (O2O_2 and CO2CO_2) take place in our lungs?
    Solution
    The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other. This barrier between air and blood averages about 1 micron  in thickness. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
    So the correct option is 'alveoli'.
  • Question 7
    1 / -0
    In which part of the body blood gets oxygenated?
    Solution
    During pulmonary circulation, blood enters from the right atrium into the right ventricle. The right ventricle pumps the blood to the lungs where it gets oxygenated. The oxygenated blood enters the left atrium through the pulmonary veins. From the left atrium blood enters into the left ventricle. 
    Thus, the correct answer is 'Lung.'

  • Question 8
    1 / -0
    State the respective lowest and highest value of respiratory volumes.
    Solution
    The tidal volume (TV) is the amount of air inhaled during normal and relaxed breathing. The normal value is about 500 mL. Vital capacity (VC) is the maximum amount of air that can be exhaled out after a maximum inhalation. It is sum of inspiratory reserve volume (IRV), tidal volume (TV), and expiratory reserve volume (ERV). Residual volume (RV) is the amount of air left in the lungs after a forceful exhalation. The normal value is about 1200 mL. ERV is the additional air that can be exhaled out after exhalation of tidal volume. The normal value is about 1100 mL. Inspiratory capacity (IC) is the total volume of air that can be inhaled. The normal value is about 3600 mL. Total lung capacity (TLC) is the sum of IRV, TV, and RV. It is the  total volume of air filled in the lungs after a forced inhalation. It is about 6000 mL.
    Thus, the correct answer is 'TV, TLC.'
  • Question 9
    1 / -0
    Which of the following gas when passed through dilute blood will impart a cherry red colour to the solution?
  • Question 10
    1 / -0
    In which of the following places does the formation of oxyhemoglobin occur?
    Solution
    Oxyhaemoglobin form at the surface of the alveolar surface where the concentration of oxygen increases and it release the carbon dioxide carries with it to remove out with the air and bind with oxygen and carries it to tissues.
    So the correct option is 'Alveolar surface'
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