Respiratory System Quiz - Skill 1 And Skill 2

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| By Camiloalejo
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Camiloalejo
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Questions: 5 | Attempts: 780

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Respiratory System Quiz - Skill 1 And Skill 2 - Quiz

Read all questions carefully. Always check your answers.


Questions and Answers
  • 1. 

      During exhalation, when the diaphragm relaxes and the volume of the chest cavity decreases, air pressure ________ inside the lungs.

    • A.

      Decreases, then increases

    • B.

      Increases

    • C.

      Is unchanged

    • D.

      Decreases

    Correct Answer
    D. Decreases
    Explanation
    During exhalation, when the diaphragm relaxes and the volume of the chest cavity decreases, the air pressure inside the lungs decreases. This is because as the volume of the chest cavity decreases, there is less space for the air to occupy, causing the air molecules to become more compressed and the pressure to decrease.

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  • 2. 

    Although children believe that "holding my breath until I die" is possible, parents know this to not be true because

    • A.

      As a child holds his or her breath, oxygen levels build, stimulating breathing by the brain stem.

    • B.

      As a child holds his or her breath, carbon dioxide levels decrease, stimulating breathing by the brain stem

    • C.

      As a child holds his or her breath, oxygen levels decrease, stimulating breathing by the brain stem

    • D.

      As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.

    Correct Answer
    D. As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.
    Explanation
    As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem. This is because when we hold our breath, carbon dioxide builds up in our body. The brain stem detects this increase in carbon dioxide and sends signals to stimulate breathing. This mechanism ensures that our body gets enough oxygen and prevents us from holding our breath until we die.

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  • 3. 

    In the alveoli and lung capillaries, carbon dioxide and oxygen are exchanged by means of

    • A.

      Diffusion.

    • B.

      Active transport

    • C.

      Osmosis.

    • D.

      Phagocytosis.

    Correct Answer
    A. Diffusion.
    Explanation
    In the alveoli and lung capillaries, the exchange of carbon dioxide and oxygen occurs through diffusion. Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In this case, oxygen moves from the alveoli, where its concentration is higher, to the lung capillaries, where its concentration is lower. At the same time, carbon dioxide moves from the lung capillaries, where its concentration is higher, to the alveoli, where its concentration is lower. This exchange of gases is facilitated by the thin walls and large surface area of the alveoli, allowing for efficient diffusion.

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  • 4. 

    As air is inhaled, which of the four following structures is the last to be encountered?  

    • A.

      Bronchi

    • B.

      Bronchiole

    • C.

      Larynx

    • D.

      Trachea

    Correct Answer
    B. Bronchiole
    Explanation
    The bronchiole is the last structure to be encountered as air is inhaled. After passing through the trachea and entering the bronchi, the air then enters the smaller bronchioles. The bronchioles are the smallest airways in the respiratory system and lead to the alveoli, where gas exchange occurs. Therefore, the bronchiole is the final structure that the inhaled air encounters before reaching the site of gas exchange in the lungs.

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  • 5. 

    Which picture corresponds to inhalation?

    • A.

      The left one

    • B.

      The right one

    • C.

      Both correspond to inhalition

    • D.

      None

    Correct Answer
    A. The left one
    Explanation
    The left picture corresponds to inhalation because it shows a person taking a deep breath in, with their chest expanding and their diaphragm lowering. This is the typical physical movement that occurs during inhalation, allowing air to enter the lungs. The right picture does not depict this action, so it does not correspond to inhalation.

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