Take The Quiz To Know About Structure and function of the alveoli

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Take The Quiz To Know About Structure And Function Of The Alveoli - Quiz

The lungs are essential organs for gaseous exchange in the body. We encourage you to take the quiz to learn more about the structure and functions of the alveoli. The alveoli are the smallest unit of gaseous exchange in the body. The question in this quiz will surely make you think! All the questions are compulsory, so please make sure to read all the questions carefully before answering. There's no time limit, so feel free to take up the quiz as often as you prefer. Keep learning! All the very best!


Questions and Answers
  • 1. 

    The tiny sacs of air present in the human lungs are known as what?

    • A.

      Bronchus

    • B.

      Bronchioles

    • C.

      Alveoli

    • D.

      None of the above

    Correct Answer
    C. Alveoli
    Explanation
    The tiny sacs of air present in the human lungs are known as alveoli. These small structures are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. They have thin walls and a large surface area, allowing for efficient gas exchange. Bronchus and bronchioles are parts of the respiratory system, but they do not refer specifically to the sacs of air in the lungs. Therefore, the correct answer is alveoli.

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  • 2. 

    Where do bronchi enter the lungs? 

    • A.

      At Hilus

    • B.

      At the apex

    • C.

      At the epiglottis 

    • D.

      A the larynx

    Correct Answer
    A. At Hilus
    Explanation
    The bronchi enter the lungs at the hilus. The hilus is a depression on the medial surface of each lung where the bronchi, blood vessels, lymphatic vessels, and nerves enter and exit the lungs. It is the point of entry and exit for various structures that are essential for the functioning of the lungs.

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  • 3. 

    Surfactants are the fluid inside the lungs that help maintain their balloon shape. What type of cells produces Surfactants?

    • A.

      Type I pneumocytes

    • B.

      Type II pneumocytes

    • C.

      Macrophages 

    • D.

      Bronchioles 

    Correct Answer
    B. Type II pneumocytes
    Explanation
    Type II pneumocytes are the cells responsible for producing surfactants in the lungs. Surfactants are essential for reducing surface tension in the alveoli, preventing their collapse and maintaining their shape. Type I pneumocytes, on the other hand, are involved in gas exchange. Macrophages are immune cells that remove debris and pathogens, while bronchioles are small air passages in the lungs.

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  • 4. 

    Which structure is s located between two pleural sacs and is known as the central compartment of the thoracic cavity?

    • A.

      Mediastinum

    • B.

      Thoracic cage

    • C.

      Pleura

    • D.

      Hilum

    Correct Answer
    A. Mediastinum
    Explanation
    The correct answer is Mediastinum. The mediastinum is located between the two pleural sacs and is considered the central compartment of the thoracic cavity. It contains various structures such as the heart, major blood vessels, esophagus, trachea, thymus, and lymph nodes. It plays a crucial role in providing support and protection to these structures within the thoracic cavity.

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  • 5. 

    What type of cells make up the alveoli? 

    • A.

      Epithelial cells

    • B.

      Muscle cells

    • C.

      Connective cells

    • D.

      Nervous cells

    Correct Answer
    A. Epithelial cells
    Explanation
    Alveoli are tiny air sacs in the lungs responsible for gas exchange. Epithelial cells line the alveoli and play a crucial role in this process. They are thin and flat, allowing for efficient diffusion of oxygen and carbon dioxide between the lungs and bloodstream. Epithelial cells also produce a surfactant that helps prevent the alveoli from collapsing. Muscle cells, connective cells, and nervous cells are not present in the alveoli and do not have a direct role in gas exchange.

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  • 6. 

    A typical pair of human lungs have about how many alveoli? 

    • A.

      1 million

    • B.

      100 million 

    • C.

      300 million

    • D.

      500 million 

    Correct Answer
    C. 300 million
    Explanation
    Human lungs contain approximately 300 million alveoli. Alveoli are tiny air sacs located at the end of the bronchioles in the lungs, and they are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. The large number of alveoli allows for a large surface area, maximizing the efficiency of gas exchange.

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  • 7. 

    Which of the following is among the alveolar lung diseases? 

    • A.

      Pneumonia

    • B.

      Tuberculosis

    • C.

      Emphysema

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the options listed, namely pneumonia, tuberculosis, and emphysema, are considered alveolar lung diseases. Pneumonia is an infection that causes inflammation in the alveoli, the tiny air sacs in the lungs. Tuberculosis is a bacterial infection that primarily affects the lungs, causing inflammation and damage to the alveoli. Emphysema is a chronic lung condition where the alveoli become damaged and lose their elasticity, leading to difficulty in breathing. Therefore, all of these conditions fall under the category of alveolar lung diseases.

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  • 8. 

    Which of the following structures helps function by filtering and keeping the mucus and dirt away from the lungs?

    • A.

      Cilia

    • B.

      Bronchioles

    • C.

      Bronchioles

    • D.

      Trachea

    Correct Answer
    A. Cilia
    Explanation
    Cilia are small, hair-like structures that line the respiratory tract. They work by constantly beating in a coordinated manner to move mucus and trapped particles away from the lungs towards the throat, where they can be coughed out or swallowed. This helps to keep the airways clear and prevent the accumulation of mucus and dirt in the lungs, thus aiding in the proper functioning of the respiratory system.

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  • 9. 

     The maximum volume of air contained in the lung by a full forced inhalation is called what? 

    • A.

      Vital capacity

    • B.

      Total lung capacity

    • C.

      Ventilation rate

    • D.

      Tidal volume

    Correct Answer
    B. Total lung capacity
    Explanation
    Total lung capacity refers to the maximum volume of air that can be contained in the lungs after a full forced inhalation. It represents the sum of all the lung volumes, including tidal volume, inspiratory reserve volume, and expiratory reserve volume. This measurement is important in assessing lung function and can be used to diagnose respiratory conditions such as chronic obstructive pulmonary disease (COPD) or restrictive lung diseases.

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  • 10. 

    Which of the following microorganism causes tuberculosis? 

    • A.

      Bacillus anthracis

    • B.

      Vibrio cholerae

    • C.

      Mycobacterium tuberculosis

    • D.

      Bacillus thuringiensis

    Correct Answer
    C. Mycobacterium tuberculosis
    Explanation
    Mycobacterium tuberculosis is the correct answer because it is the specific microorganism that causes tuberculosis. Bacillus anthracis causes anthrax, Vibrio cholerae causes cholera, and Bacillus thuringiensis is a common soil bacterium used as a biological pesticide.

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