Gr 9 NATUURWETENSKAPPE: HFST 1.4 Asemhaling
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Questions and Answers

What happens to the rib cage during inhalation?

  • It moves downwards and inwards.
  • It disappears.
  • It moves upwards and outwards. (correct)
  • It remains stationary.

    • What type of blood is pumped by the heart to the rest of the body?

  • Blood with high oxygen levels only
  • Blood rich in oxygen (correct)
  • Blood carrying carbon dioxide
  • Blood with low oxygen levels

    • What is the function of the alveoli?

  • To regulate body temperature.
  • To facilitate gas exchange between the air and blood. (correct)
  • To produce carbon dioxide.
  • To store oxygen in the lungs.

    • What happens to the diaphragm during inhalation?

    <p>It contracts and flattens</p> Signup and view all the answers

    During exhalation, what happens to the diaphragm?

    <p>It relaxes and becomes dome-shaped again.</p> Signup and view all the answers

    What is the role of the heart in the respiratory system?

    <p>To pump oxygenated blood to the body and deoxygenated blood to the lungs.</p> Signup and view all the answers

    What is the result of the decreased thoracic volume during exhalation?

    <p>Air is expelled from the lungs</p> Signup and view all the answers

    What happens to the air during inhalation?

    <p>It is pulled into the lungs.</p> Signup and view all the answers

    What is the function of the intercostal muscles during inhalation?

    <p>They contract, expanding the rib cage</p> Signup and view all the answers

    What type of blood returns to the heart and is then pumped to the lungs?

    <p>Blood carrying carbon dioxide and other wastes</p> Signup and view all the answers

    What is the pathway of air during inhalation?

    <p>Mouth and nose -&gt; pharynx -&gt; larynx -&gt; trachea.</p> Signup and view all the answers

    What is the result of the increased thoracic volume during inhalation?

    <p>Air flows in</p> Signup and view all the answers

    What is the function of haemoglobin molecules in red blood cells?

    <p>To transport oxygen from the lungs to the body.</p> Signup and view all the answers

    What happens to the rib cage during exhalation?

    <p>It contracts</p> Signup and view all the answers

    What is the purpose of the breathing mechanism?

    <p>To facilitate gas exchange</p> Signup and view all the answers

    What is the result of the increased chest cavity volume during inhalation?

    <p>The lungs expand to fill the extra space</p> Signup and view all the answers

    What happens to the air in the alveoli during exhalation?

    <p>It is pushed out of the alveoli</p> Signup and view all the answers

    What is the purpose of the diffusion process in the alveoli?

    <p>To facilitate the exchange of oxygen and carbon dioxide</p> Signup and view all the answers

    What is the function of the bronchioles in the lungs?

    <p>To further branch into tiny air sacs</p> Signup and view all the answers

    What is the role of haemoglobin molecules in red blood cells?

    <p>To bind to oxygen molecules</p> Signup and view all the answers

    What is the result of the increased pressure inside the chest cavity during exhalation?

    <p>The lungs are compressed, forcing air out</p> Signup and view all the answers

    What is the purpose of the pharynx in the respiratory system?

    <p>To allow air to pass from the mouth and nose into the larynx</p> Signup and view all the answers

    What is the primary function of the heart in the respiratory system?

    <p>To pump oxygen-rich blood to the rest of the body</p> Signup and view all the answers

    What happens to the internal pressure during inhalation?

    <p>It decreases</p> Signup and view all the answers

    What is the direction of air flow during inhalation?

    <p>Into the lungs</p> Signup and view all the answers

    What is the primary function of the intercostal muscles?

    <p>To facilitate breathing</p> Signup and view all the answers

    What is the result of the diaphragm relaxing and returning to its dome shape?

    <p>Air is pushed out of the lungs</p> Signup and view all the answers

    What is the role of the network of blood vessels in the respiratory system?

    <p>To transport oxygen-rich blood to the rest of the body</p> Signup and view all the answers

    What is the result of the diaphragm contracting and flattening?

    <p>Air is pulled into the lungs</p> Signup and view all the answers

    What is the type of blood that returns to the heart and is then pumped to the lungs?

    <p>Deoxygenated blood</p> Signup and view all the answers

    What happens to the volume of the chest cavity during inhalation?

    <p>It increases</p> Signup and view all the answers

    What is the primary function of the alveoli in the respiratory system?

    <p>To facilitate gas exchange between the air and blood</p> Signup and view all the answers

    What happens to the carbon dioxide in the blood during exhalation?

    <p>It is diffused into the alveoli</p> Signup and view all the answers

    What is the role of the bronchi in the respiratory system?

    <p>To branch into smaller airways</p> Signup and view all the answers

    What happens to the pressure inside the chest cavity during exhalation?

    <p>It increases</p> Signup and view all the answers

    What is the pathway of air during exhalation?

    <p>Lungs → bronchi → trachea → pharynx → mouth and nose</p> Signup and view all the answers

    What is the role of haemoglobin molecules in red blood cells?

    <p>To bind to oxygen and transport it to the body's tissues</p> Signup and view all the answers

    What is the primary function of the heart in relation to oxygenated blood?

    <p>To pump oxygenated blood to the rest of the body through a network of blood vessels.</p> Signup and view all the answers

    What happens to the internal pressure during exhalation?

    <p>It increases, causing air to flow out of the lungs.</p> Signup and view all the answers

    What is the result of the intercostal muscles contracting during inhalation?

    <p>The rib cage expands, decreasing the internal pressure.</p> Signup and view all the answers

    What is the function of the breathing mechanism in the body?

    <p>To facilitate gas exchange between the lungs and the environment.</p> Signup and view all the answers

    What happens to the diaphragm during exhalation?

    <p>It relaxes and returns to its dome shape, pushing air out of the lungs.</p> Signup and view all the answers

    What is the result of the increased thoracic volume during inhalation?

    <p>Air is pulled into the lungs.</p> Signup and view all the answers

    What type of blood is pumped to the lungs for gas exchange?

    <p>Deoxygenated blood.</p> Signup and view all the answers

    What is the result of the diaphragm contracting and flattening during inhalation?

    <p>Air is pulled into the lungs.</p> Signup and view all the answers

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