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Breathing and Exchange of Gases Test 22

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Breathing and Exchange of Gases Test 22
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  • Question 1
    1 / -0
    The narrowest and most numerous tubes of lungs are termed as
    Solution

    A.Bronchus - a passage of airway in the respiratory system that conducts air into the lungs.

    B.Alveoli - any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.

    C.Bronchioles - any of the minute branches into which a bronchus divides.

    D.Hilum - a part of an organ where structures such as blood vessels and nerves enter the body.

    So, the correct option is ‘Bronchioles’

  • Question 2
    1 / -0
    Emphysema is a condition resulting from
    Solution
    Emphysema is a chronic lung disease in which person faces difficulty in breathing from a limitation in blowing air out. The most common cause of emphysema is smoking. Thus, option A is correct. 
  • Question 3
    1 / -0
    Percentage of $$O_2$$ present in inhaled air in man is about
    Solution
    Inhaled air contains more oxygen used to create energy and less CO$$_2$$. It contains 21% O$$_2$$, 0.04% CO$$_2$$ and 79% Nitrogen. Thus, option A is correct. 
  • Question 4
    1 / -0
    The tissue respiration refers to
    Solution
    Respiration is the process by which oxygen and carbon dioxide diffuse in and out of the blood. Respiration is also referred to as gas exchange, and it occurs in two areas of the body. External respiration refers to gas exchange across the respiratory membrane in the lungs. Internal respiration refers to gas exchange across the respiratory membrane in the metabolizing tissues, like your skeletal muscles. Expiration and inspiration are not the related terms of respiration. Thus, option C is correct.
  • Question 5
    1 / -0
    Bronchitis is the abnormality of
    Solution
    Bronchitis is an inflammation or swelling of the bronchial tubes (bronchi), the air passages between the nose and the lungs. Bronchitis is a condition where the lining of the bronchial tubes becomes inflamed or infected. People with bronchitis have a reduced ability to breathe in air and oxygen into their lungs; they also have heavy mucus or phlegm forming in their airways.
    Therefore, the correct answer is option B.
  • Question 6
    1 / -0
    Respiration is the mechanism for
    Solution
    In physiology, respiration is defined as the transport of oxygen from the outside air to the cells within tissues and the transport of carbon dioxide in the opposite direction also called as breathing.
    Biochemical definition of respiration - the metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and 38 ATP (energy).
    Therefore, the correct answer is option C.

  • Question 7
    1 / -0
    Lungs in the thoracic cavity is seperated form the abdominal cavity by means of
    Solution
    The thoracic diaphragm, or simply the diaphragm, is a sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity. The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration. As the diaphragm contracts, the volume of the thoracic cavity increases and air is forced into the lungs. The peritoneum is the serous membrane that forms the lining of the abdominal cavity or coelom in amniotes and some invertebrates. Pleura is each of a pair of serous membranes lining the thorax and enveloping the lungs in humans and other mammals. The trachea, colloquially called windpipe, is a tube that connects the pharynx and larynx to the lungs, allowing the passage of air. 
    Therefore, the correct answer is option D.
  • Question 8
    1 / -0
    Lungs have a large number of alveoli for 
    Solution
    There are about 300 million alveoli in each of the lungs. These tiny air sacs provide an ideal site for the diffusion of the gases into and out of the blood (gas exchange). The alveoli have a very large surface area. This large surface area is the result of all the alveoli being small spheres.
    Therefore, the correct answer is option B.
  • Question 9
    1 / -0
    Tissue respiration is a type of
    Solution
    External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells. Inspiration and expirations are breath in and breath out processes. 
    Therefore, the correct answer is option B.
  • Question 10
    1 / -0
    Trachea branches to two thinner tubes called as
    Solution
    A bronchus, also known as a main or primary bronchus, is a passage of airway in the respiratory tract that conducts air into the lungs. There is a right bronchus and a left bronchus and these bronchi branch into smaller secondary and tertiary bronchi which branch into smaller tubes, known as bronchioles. No gas exchange takes place in the bronchi. The trachea (windpipe) divides into two main or primary bronchi, the left and the right, at the level of the sternal angle and of the fifth thoracic vertebra or up to two vertebrae higher or lower, depending on breathing, at the anatomical point the carina of trachea. An alveolus is an anatomical structure that has the form of a hollow cavity. Thus, option B is correct.
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