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Respiration and Gaseous Exchange
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Respiration and Gaseous Exchange

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Questions and Answers

What is the primary function of respiration in the body?

  • To produce energy for the body
  • To provide oxygen and eliminate carbon dioxide (correct)
  • To regulate body temperature
  • To maintain blood pressure

    • Where does external respiration occur?

  • In the muscles
  • In the lungs (correct)
  • In the tissues
  • In the bloodstream

    • What is the mechanism by which gas exchange occurs?

  • Facilitated diffusion
  • Simple diffusion (correct)
  • Active transport
  • Passive transport

    • What is the characteristic of carbon dioxide in blood?

    <p>It is more soluble than oxygen</p> Signup and view all the answers

    What is the purpose of the features of alveoli?

    <p>To speed up the rate of diffusion</p> Signup and view all the answers

    What is the advantage of the alveolar epithelium being only one cell thick?

    <p>It provides a short diffusion pathway, which speeds up diffusion.</p> Signup and view all the answers

    What percentage of oxygen is transported in the bloodstream as dissolved oxygen?

    <p>1.5%</p> Signup and view all the answers

    What is the role of heme in the transport of oxygen in the blood?

    <p>It binds to oxygen molecules.</p> Signup and view all the answers

    What is the result of the reversible chemical reaction between hemoglobin and oxygen?

    <p>The formation of oxyhemoglobin.</p> Signup and view all the answers

    What is the process by which oxygen is released from hemoglobin in humans?

    <p>Oxygen dissociation.</p> Signup and view all the answers

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