Circulation & Respiration
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Questions and Answers

What is the main purpose of the breathing system?

  • To get oxygen needed for respiration and eliminate waste carbon dioxide (correct)
  • To release energy
  • To slow down the pulse
  • To pump blood around the body
  • Which process is also known as inhalation?

  • Getting rid of carbon dioxide
  • Pumping blood around the body
  • Breathing in air, including oxygen, into the lungs (correct)
  • Breathing out
  • Where does gas exchange take place in the respiratory system?

  • Bronchi
  • Trachea
  • Diaphragm
  • Alveoli (correct)
  • What happens to oxygen in the alveoli?

    <p>It is transferred into the blood</p> Signup and view all the answers

    Why do muscle cells need oxygen and glucose slowly?

    <p>To prevent sudden energy spikes</p> Signup and view all the answers

    How does the body control the pulse rate during exercise?

    <p>By increasing the breathing rate</p> Signup and view all the answers

    What is the main function of the circulation system in the body?

    <p>Carry dissolved food and oxygen to the body's cells</p> Signup and view all the answers

    Which part of the circulatory system is responsible for exchanging materials by diffusion between the blood and the interstitial fluid?

    <p>Blood vessels</p> Signup and view all the answers

    What type of circulatory system do humans have?

    <p>Closed circulatory system</p> Signup and view all the answers

    Which chamber of the heart receives oxygen-poor blood from the body?

    <p>Right atrium</p> Signup and view all the answers

    What is the main function of the pulmonary circuit in circulation?

    <p>Exchange gases in the lungs</p> Signup and view all the answers

    Which blood pathway starts from the right side of the heart, goes to the lungs, and returns to the left side of the heart?

    <p>Pulmonary circuit</p> Signup and view all the answers

    What is the main function of the thin walls of alveoli in the lungs?

    <p>To allow for quick gas exchange between lungs and blood</p> Signup and view all the answers

    What is the main difference in the composition of nitrogen between inhaled and exhaled air?

    <p>Exhaled air has more nitrogen</p> Signup and view all the answers

    Which gas shows a significant decrease in percentage from inhaled to exhaled air?

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

    What is the consequence of lactic acid build-up in muscle cells during anaerobic respiration?

    <p>Causes fatigue and cramping</p> Signup and view all the answers

    Which type of respiration occurs when oxygen and glucose are readily available to cells?

    <p>Aerobic respiration</p> Signup and view all the answers

    What happens when the body cannot supply cells with enough oxygen for glucose breakdown?

    <p>Anaerobic respiration occurs</p> Signup and view all the answers

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