Gas Exchange In Humans.

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| By Kimcheecolin
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Kimcheecolin
Community Contributor
Quizzes Created: 2 | Total Attempts: 460
Questions: 18 | Attempts: 357

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Gas Exchange In Humans. - Quiz

This is a quiz to help you assess your understanding of the mechanisms involved in ventilation / gas exchange.


Questions and Answers
  • 1. 

    What is structure C? 

    • A.

      Right lung

    • B.

      Diaphragm

    • C.

      Rib

    • D.

      Bronchiole

    • E.

      Abdominal Cavity

    • F.

      Intercostal Muscle

    • G.

      Thorax

    • H.

      Trachea

    • I.

      Primary Bronchus

    Correct Answer
    H. Trachea
    Explanation
    The correct answer is Trachea. The question is asking for the identification of structure C, and out of the given options, the trachea is the correct answer. The trachea is a tube-like structure that connects the larynx to the bronchi and allows the passage of air to and from the lungs. It is located in the thorax and is an essential part of the respiratory system.

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  • 2. 

    Inspiration involves...

    • A.

      Involves an increase in thoracic volume and a decrease in thoracic pressure

    • B.

      Involves an increase in thoracic volume and a decrease in thoracic pressure

    • C.

      Involves a decrease in thoracic volume and an increase in pressure

    • D.

      Involves an increase in thoracic volume and an increase in thoracic pressure

    Correct Answer
    B. Involves an increase in thoracic volume and a decrease in thoracic pressure
    Explanation
    Don't forget Boyle's law - Volume is inversely proportional to pressure. So to exhale

    Don't forget Boyle's Law - Volume is inversely proportional to pressure. So when we inhale the thorax increases its volume, decreasing its pressure below that of the atmosphere and a pressure gradient is generated so air rushes into the lungs.

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  • 3. 

    Expiration 

    • A.

      Involves a decrease in thoracic volume and a decrease in thoracic pressure

    • B.

      Involves an increase in thoracic volume and a decrease in thoracic pressure

    • C.

      Involves a decrease in thoracic volume and an increase in pressure

    • D.

      Involves a decrease in thoracic volume and an increase in thoracic pressure

    Correct Answer
    D. Involves a decrease in thoracic volume and an increase in thoracic pressure
    Explanation
    Don't forget Boyle's Law - Volume is inversely proportional to volume. So to expire the volume of the thorax decreases increasing the pressure to greater than atmospheric forcing exhalation.

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  • 4. 

    Breathing in is passive - no muscle contraction involved.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Breathing in is not passive, it requires the contraction of the diaphragm and intercostal muscles to expand the chest cavity and allow air to enter the lungs. Therefore, the statement is false.

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  • 5. 

    Breathing in is active - muscle contraction is involved.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Breathing in is an active process that requires the contraction of certain muscles. The diaphragm, a large muscle located below the lungs, contracts and moves downward, while the muscles between the ribs also contract and lift the ribcage. These actions increase the volume of the chest cavity, causing air to be drawn into the lungs. Therefore, breathing in involves active muscle contraction.

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  • 6. 

    During inspiration

    • A.

      The diaphragm relaxes and flattens

    • B.

      The diaphragm relaxes and assumes a dome shape

    • C.

      The diaphragm contracts and flattens

    • D.

      The diaphragm contracts and assumes a dome shape

    Correct Answer
    C. The diaphragm contracts and flattens
    Explanation
    During inspiration, the diaphragm contracts and flattens. This allows the lungs to expand and fill with air. The contraction of the diaphragm creates a downward movement, which increases the volume of the thoracic cavity. As a result, the pressure inside the lungs decreases, causing air to flow in and fill the expanded space. The flattening of the diaphragm helps in increasing the efficiency of the breathing process by maximizing the amount of air that can be inhaled.

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  • 7. 

    During inspiration

    • A.

      The diaphragm relaxes and flattens decreasing thoracic volume

    • B.

      The diaphragm contracts and assumes a dome shape increasing thoracic volume

    • C.

      The diaphragm contracts and flattens increasing thoracic volume

    • D.

      The diaphragm relaxes and assumes a dome shape decreasing thoracic volume

    Correct Answer
    C. The diaphragm contracts and flattens increasing thoracic volume
    Explanation
    During inspiration, the diaphragm contracts and flattens, which increases the volume of the thoracic cavity. This allows for the expansion of the lungs and the intake of air. The contraction of the diaphragm creates more space in the thoracic cavity, leading to an increase in thoracic volume.

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  • 8. 

    During expiration

    • A.

      The diaphragm relaxes and flattens decreasing thoracic volume

    • B.

      The diaphragm contracts and assumes a dome shape increasing thoracic volume

    • C.

      The diaphragm contracts and flattens increasing thoracic volume

    • D.

      The diaphragm relaxes and assumes a dome shape decreasing thoracic volume

    Correct Answer
    D. The diaphragm relaxes and assumes a dome shape decreasing thoracic volume
    Explanation
    During expiration, the diaphragm relaxes and assumes a dome shape, which leads to a decrease in thoracic volume. This is because when the diaphragm relaxes, it moves upwards, causing the dome shape and reducing the space in the thoracic cavity. As a result, the pressure in the thoracic cavity increases, forcing air out of the lungs.

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  • 9. 

    During inspiration 

    • A.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm contracts increasing thoracic volume

    • B.

      The intercostal muscles relax pulling the rib cage down and in - the diaphragm relaxes decreasing thoracic volume

    • C.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm relaxes increasing thoracic volume

    • D.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm contracts decreasing thoracic volume

    Correct Answer
    A. The intercostal muscles contract pulling the rib cage up and out - the diaphragm contracts increasing thoracic volume
    Explanation
    During inspiration, the intercostal muscles contract, which causes the rib cage to move up and outwards. At the same time, the diaphragm also contracts, which increases the volume of the thoracic cavity. This expansion of the thoracic cavity creates a lower pressure inside the lungs, allowing air to be drawn in. Therefore, the correct answer is that the intercostal muscles contract pulling the rib cage up and out, while the diaphragm contracts increasing thoracic volume.

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  • 10. 

    During expiration

    • A.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm contracts increasing thoracic volume

    • B.

      The intercostal muscles relax pulling the rib cage down and in - the diaphragm relaxes decreasing thoracic volume

    • C.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm relaxes increasing thoracic volume

    • D.

      The intercostal muscles contract pulling the rib cage up and out - the diaphragm contracts decreasing thoracic volume

    Correct Answer
    B. The intercostal muscles relax pulling the rib cage down and in - the diaphragm relaxes decreasing thoracic volume
    Explanation
    During expiration, the intercostal muscles relax, causing the rib cage to move downwards and inwards. At the same time, the diaphragm also relaxes, which decreases the thoracic volume. This combination of relaxation in the intercostal muscles and the diaphragm results in a decrease in the volume of the thoracic cavity, leading to expiration.

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  • 11. 

    What is structure g? 

    • A.

      Right lung

    • B.

      Diaphragm

    • C.

      Rib

    • D.

      Bronchiole

    • E.

      Abdominal Cavity

    • F.

      Intercostal Muscle

    • G.

      Thorax

    • H.

      Trachea

    • I.

      Primary Bronchus

    Correct Answer
    A. Right lung
    Explanation
    The structure g in this question refers to the right lung.

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  • 12. 

    What is structure f? 

    • A.

      Right lung

    • B.

      Diaphragm

    • C.

      Rib

    • D.

      Bronchiole

    • E.

      Abdominal Cavity

    • F.

      Intercostal Muscle

    • G.

      Thorax

    • H.

      Trachea

    • I.

      Primary Bronchus

    Correct Answer
    D. Bronchiole
    Explanation
    A bronchiole is a small airway in the respiratory system that branches off from the bronchus. It is responsible for conducting air to the alveoli in the lungs. The other options listed are incorrect because they do not pertain to the specific structure f being asked about. The correct answer, bronchiole, is the only option that accurately describes a component of the respiratory system.

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  • 13. 

    What is structure j? 

    • A.

      Right lung

    • B.

      Diaphragm

    • C.

      Rib

    • D.

      Bronchiole

    • E.

      Abdominal Cavity

    • F.

      Intercostal Muscle

    • G.

      Thorax

    • H.

      Trachea

    • I.

      Primary Bronchus

    Correct Answer
    F. Intercostal Muscle
    Explanation
    The intercostal muscles are located between the ribs and play a crucial role in the process of breathing. They help expand and contract the ribcage, allowing for inhalation and exhalation. Therefore, structure j in this context refers to the intercostal muscle.

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  • 14. 

    What is structure a? 

    • A.

      Right lung

    • B.

      Diaphragm

    • C.

      Rib

    • D.

      Bronchiole

    • E.

      Abdominal Cavity

    • F.

      Intercostal Muscle

    • G.

      Thorax

    • H.

      Trachea

    • I.

      Primary Bronchus

    Correct Answer
    E. Abdominal Cavity
  • 15. 

    What is structure i? 

    • A.

      Thorax

    • B.

      Trachea

    • C.

      Primary Bronchus

    • D.

      Right lung

    • E.

      Diaphragm

    • F.

      Rib

    • G.

      Bronchiole

    • H.

      Abdominal Cavity

    • I.

      Intercostal Muscle

    Correct Answer
    E. Diaphragm
    Explanation
    The structure i is the diaphragm. The diaphragm is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. It plays a crucial role in the process of breathing by contracting and relaxing to help with inhalation and exhalation.

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  • 16. 

    What is structure b? 

    • A.

      Thorax

    • B.

      Trachea

    • C.

      Primary Bronchus

    • D.

      Right lung

    • E.

      Diaphragm

    • F.

      Rib

    • G.

      Bronchiole

    • H.

      Abdominal Cavity

    • I.

      Intercostal Muscle

    Correct Answer
    A. Thorax
    Explanation
    The structure b in this question is the thorax. The thorax is the region of the body between the neck and the abdomen, and it contains important organs such as the heart, lungs, and ribs.

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  • 17. 

    What is structure h? 

    • A.

      Thorax

    • B.

      Trachea

    • C.

      Primary Bronchus

    • D.

      Right lung

    • E.

      Diaphragm

    • F.

      Rib

    • G.

      Bronchiole

    • H.

      Abdominal Cavity

    • I.

      Intercostal Muscle

    Correct Answer
    F. Rib
    Explanation
    The structure h is a rib.

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  • 18. 

    What is structure e? 

    • A.

      Thorax

    • B.

      Trachea

    • C.

      Primary Bronchus

    • D.

      Right lung

    • E.

      Diaphragm

    • F.

      Rib

    • G.

      Bronchiole

    • H.

      Abdominal Cavity

    • I.

      Intercostal Muscle

    • J.

      Alveoli

    Correct Answer
    J. Alveoli
    Explanation
    The structure "e" in this question refers to the alveoli. Alveoli are tiny air sacs located at the end of the bronchioles in the lungs. They are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. Oxygen is taken in through the alveoli and carbon dioxide is expelled from the body through them. They greatly increase the surface area available for gas exchange, allowing for efficient respiration.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 29, 2015
    Quiz Created by
    Kimcheecolin
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