Gr 9 NATURAL SCIENCES: CH 1.4 Gaseous exchange in the lungs

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Questions and Answers

What is the function of the alveoli in the lungs?

  • To facilitate the exchange of gases (correct)
  • To store oxygen
  • To produce carbon dioxide
  • To distribute air throughout the lungs

What is the main factor that allows for efficient diffusion of gases between the alveoli and the blood?

  • The high concentration of oxygen in the blood
  • The low concentration of carbon dioxide in the alveoli
  • The close association of alveoli and capillaries (correct)
  • The large surface area of the bronchi

What is the process of diffusion in the lungs?

  • The exchange of gases between the alveoli and the bronchi
  • The movement of particles from an area of high concentration to an area of low concentration (correct)
  • The transport of oxygen from the lungs to the body
  • The movement of particles from an area of low concentration to an area of high concentration

What happens to oxygen during inhalation in the lungs?

<p>It is diffused from the alveoli into the blood (D)</p> Signup and view all the answers

What is the purpose of the bronchi and bronchioles in the lungs?

<p>To distribute air throughout the lungs (A)</p> Signup and view all the answers

What happens to carbon dioxide during exhalation in the lungs?

<p>It is diffused from the blood into the alveoli (D)</p> Signup and view all the answers

What is the main advantage of having a large surface area in alveoli?

<p>To facilitate the diffusion of gases (B)</p> Signup and view all the answers

What is the function of haemoglobin in red blood cells during gaseous exchange?

<p>To bind to oxygen, forming oxyhaemoglobin (C)</p> Signup and view all the answers

What is the characteristic of the walls of the alveoli?

<p>They are one cell thick (C)</p> Signup and view all the answers

What is the result of efficient gaseous exchange?

<p>The maintenance of homeostasis in the body (A)</p> Signup and view all the answers

What is a consequence of damage to alveoli?

<p>A decrease in the surface area for gas exchange (A)</p> Signup and view all the answers

What is the term for the narrowing of airways, impeding airflow to the alveoli?

<p>Asthma (C)</p> Signup and view all the answers

Where does oxygen from the air diffuse into during gaseous exchange?

<p>The red blood cells in the capillaries (B)</p> Signup and view all the answers

What is the term for the infection leading to fluid-filled alveoli, impairing gas exchange?

<p>Pneumonia (D)</p> Signup and view all the answers

Why is it essential to maintain efficient gaseous exchange?

<p>To ensure the delivery of oxygen to cells and the removal of carbon dioxide (D)</p> Signup and view all the answers

What is the primary function of the moist surfaces of alveoli?

<p>To help gases dissolve and diffuse more rapidly (B)</p> Signup and view all the answers

What is the significance of the rich blood supply surrounding the alveoli?

<p>To ensure a constant supply of blood for gas exchange (D)</p> Signup and view all the answers

What is the primary consequence of asthma on gaseous exchange?

<p>Impeded airflow to the alveoli (B)</p> Signup and view all the answers

What is the primary role of oxyhaemoglobin in the gaseous exchange process?

<p>To transport oxygen from the lungs to the body cells (D)</p> Signup and view all the answers

What is the primary cause of impaired gaseous exchange in emphysema?

<p>Damage to the alveoli, reducing the surface area for gas exchange (B)</p> Signup and view all the answers

What is the significance of efficient gaseous exchange for the body?

<p>To ensure the continuous supply of oxygen to body cells and removal of carbon dioxide (C)</p> Signup and view all the answers

What is the term for the process by which oxygen is taken up and carbon dioxide is removed during gaseous exchange?

<p>Gaseous exchange (D)</p> Signup and view all the answers

What is the primary effect of pneumonia on gaseous exchange?

<p>Impaired gas exchange due to fluid-filled alveoli (C)</p> Signup and view all the answers

What is the shape of the clusters of air sacs that provide a large surface area for gaseous exchange?

<p>Grape-like (B)</p> Signup and view all the answers

During which process does oxygen diffuse from the alveoli into the blood?

<p>Inhalation (C)</p> Signup and view all the answers

What is the direction of movement of particles during diffusion in the lungs?

<p>From high concentration to low concentration (B)</p> Signup and view all the answers

What is the result of the diffusion of carbon dioxide during exhalation?

<p>Carbon dioxide is expelled during exhalation (C)</p> Signup and view all the answers

What is the purpose of the dense network of capillaries surrounding the alveoli?

<p>To facilitate efficient diffusion of gases (C)</p> Signup and view all the answers

What is the term for the movement of oxygen from an area of high concentration to an area of low concentration during inhalation?

<p>Diffusion (B)</p> Signup and view all the answers

What is the characteristic of the lungs that allows them to adapt to their function of gaseous exchange?

<p>They are soft, pink, and spongy (A)</p> Signup and view all the answers

What is the primary reason for the adaptability of the lungs to optimize gaseous exchange?

<p>Increase in surface area for diffusion (B)</p> Signup and view all the answers

What is the effect of the thin walls of the alveoli on the diffusion of gases?

<p>It allows for rapid diffusion of gases (A)</p> Signup and view all the answers

During which stage of the breathing process is the concentration of oxygen higher in the alveoli than in the blood?

<p>Inhalation (C)</p> Signup and view all the answers

What is the direction of movement of carbon dioxide during exhalation?

<p>From the blood to the alveoli (D)</p> Signup and view all the answers

What is the significance of the bronchi and bronchioles in the lungs?

<p>They distribute air throughout the lungs (C)</p> Signup and view all the answers

What is the primary function of the alveoli in the lungs?

<p>To facilitate the exchange of gases (C)</p> Signup and view all the answers

What is the relationship between the concentration of oxygen in the alveoli and the blood during inhalation?

<p>The concentration of oxygen is lower in the blood (C)</p> Signup and view all the answers

Which of the following is a consequence of having a large surface area in the alveoli?

<p>Increased diffusion of oxygen into the blood (A)</p> Signup and view all the answers

What is the primary role of the capillaries surrounding the alveoli?

<p>To facilitate the exchange of gases between the alveoli and the blood (A)</p> Signup and view all the answers

What is the primary effect of pneumonia on gaseous exchange?

<p>Impaired diffusion of gases due to fluid-filled alveoli (A)</p> Signup and view all the answers

What is the primary function of oxyhaemoglobin in the gaseous exchange process?

<p>To bind to oxygen in the alveoli and transport it to the body cells (B)</p> Signup and view all the answers

What is the primary consequence of emphysema on gaseous exchange?

<p>Reduced surface area for gas exchange due to damaged alveoli (B)</p> Signup and view all the answers

What is the primary role of the moist surfaces of the alveoli?

<p>To help dissolve and diffuse gases more rapidly (D)</p> Signup and view all the answers

What is the primary consequence of asthma on gaseous exchange?

<p>Impaired airflow to the alveoli due to inflammation and narrowing of airways (B)</p> Signup and view all the answers

What is the primary significance of efficient gaseous exchange for the body?

<p>To ensure a continuous supply of oxygen to body cells and removal of carbon dioxide (A)</p> Signup and view all the answers

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