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Breathing and Exchange of Gases Test 57

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Breathing and Exchange of Gases Test 57
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  • Question 1
    1 / -0
    Diffusion boundary of alveoli is formed by:
    Solution
    B. Simple squamous epithelium
    Reason: The respiratory or gas-exchange region of the lung is composed of millions of alveoli, that are lined by an extremely thin, simple squamous epithelium which allows for the easy diffusion of oxygen and carbon dioxide.  In addition, cuboidal, surfactant-secreting cells, Type II pneumocytes, are also found lining the walls of alveoli. The surfactant has a vital role in lowering the surface tension of water to allow for the effective gas exchange. So the correct option is B.
  • Question 2
    1 / -0
    In which disease, due to narrowing of tracheal passages, alveoli are deprived of oxygen?
    Solution
    Asthma is a lung disorder in which the respiratory airways are narrowed due to inflammation and swelling. This causes the alveoli to become deprived of oxygen.
  • Question 3
    1 / -0
    $$O_2$$ dissociation curve is plotted between $$pO_2$$ and _____.
  • Question 4
    1 / -0
    $$CO_2$$ combines with Hb to form
    Solution
    • Haemoglobin (Hb or Hgb) is a protein in red blood cells that carries oxygen to cells and carbon dioxide to the lungs.
    • $$CO_2 $$ is carried by haemoglobin as carbamino-haemoglobin. Binding of $$CO_2 $$ to Hb occurs because in the tissues the  p$$CO_2 $$ is high and p$$O_2$$ is low.
    • About 20-25 per cent $$CO_2 $$ is transported in the form of Carbaminohaemoglobin.
    • Hence $$CO_2 $$ O2 combines with Hb to form Carbaminohaemoglobin.
    • So, the correct answer is 'Carbaminohaemoglobin'.
  • Question 5
    1 / -0
    Carbon dioxide is removed from blood in which part of the respiratory system? 
    Solution
    Carbon dioxide is transported to the lungs through blood. The capillary walls and the walls of the alveoli are single layered to allow diffusion of gases. Thus, Carbon dioxide is removed from the blood into alveoli of the respiratory system to be exhaled out.
    So, the correct answer is 'Alveoli'
  • Question 6
    1 / -0
    Oxygen is mixed with blood in which part of the respiratory system? 
    Solution
    Alveoli are sac like structures made of a single layer of squamous epithelial cells. The exchange of gases between the blood capillaries and the respiratory system occurs at the alveoli.
    So, the correct answer is 'Alveoli'
  • Question 7
    1 / -0
    Alveoli are lined with which type of epithelium? 
    Solution
    Alveoli are lined by a single layer of squamous epithelium for diffusion of gases .
    So, the correct answer is 'Squamous epithelium'
  • Question 8
    1 / -0
    Which of the following is also known as voice box?
    Solution
    Larynx is known as voice box as the vibrations caused in  its cords due to passage of air from the lungs results in sound or speech.
    So, the correct answer is 'Larynx'
  • Question 9
    1 / -0
    The ultimate end parts of the respiratory system in humans is known as
    Solution
    The bronchioles branch into primary, secondary, tertiary bronchioles and then to respiratory bronchioles that divide into sacs made of single layer of cells known as alveoli. These are the sites of gaseous exchange.
    So, the correct answer is ' Alveoli'

  • Question 10
    1 / -0
    Main part of the respiratory system which helps to puts oxygen into the bloodstream?
    Solution
    Exchange of gases to the bloodstream takes place in lungs. This, Option A is correct.
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