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The Respiratory System

The Respiratory System

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The Respiratory System

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  1. The Respiratory System Section 4 pg. 190 – 193

  2. Respiration and the Respiratory System • Breathing is made possible by your respiratory system • Respiratory System • Group of organs that take in oxygen and get rid of carbon dioxide • Includes • Nose • Throat • Lungs • Passageways that lead to lungs

  3. Respiration and the Respiratory System • Respiration • Process by which a body gets and uses oxygen and releases carbon dioxide and water • Divided into 2 parts 1 – Breathing  involves inhaling and exhaling 2 – Cellular respiration  involves chemical reactions that release energy from food

  4. Nose, Pharynx, and Larynx • Nose • The main passageway into and out of the respiratory system • Pharynx (throat) • Food and drink pass through • Branches into 2 tubes • Esophagus  leads to the stomach • Larynx  leads to the lungs • Larynx contains the vocal cords • Elastic bands that stretch across the larynx

  5. Nose, Pharynx, and Larynx • Muscles connected to the larynx control how much the vocal cords are stretched • When air flows between the cords, they vibrate and sound is produced

  6. Trachea • Larynx guards the entrance to a large tube called the trachea, or windpipe • Your body has 2 large, sponge like lungs • The trachea is the passageway for air traveling from the larynx to the lungs

  7. Bronchi and Alveoli • Trachea splits into 2 branches called bronchi (singular, bronchus) • Bronchus • One of the 2 tubes that connect the lungs with the trachea • One bronchus connects to each lung • Bronchus branch into smaller tubes that are called bronchioles • Each bronchiole branches to form tiny sacs called alveoli (singular, alveolus)

  8. Alveoli • Any of the tiny air sacs of the lungs where oxygen and carbon dioxide are exchanged • Provide large amount of surface area

  9. Breathing • When you breathe, air is sucked into or forced out of your lungs • The lungs have no muscles, so it relies on the diaphragm and rib muscles • Diaphragm • Dome-shaped muscle beneath the lungs

  10. Breathing • When you inhale, the diaphragm contracts and moves down • The chest cavity’s volume increases • At the same time, some of your rib muscles contract and lift your rib cage • As a result, your chest cavity get bigger and a vacuum is created • Air is sucked in, exhaling is this process in reverse!

  11. Breathing and Cellular Respiration • Cellular respiration • Oxygen is used by cells to release energy stored in molecules of glucose (type of sugar the body uses for energy) • But where does the oxygen come from? • Inhaling  the oxygen diffuses out of the red blood cells and into each cell • Cells use oxygen to release chemical energy • During this process, carbon dioxide and water are produced • Carbon dioxide is exhaled from the lungs

  12. Respiratory Disorders • Include • Asthma (causes bronchioles to narrow) • Emphysema (alveoli have been damaged) • Sever acute respiratory syndrome (SARS) • Caused by a virus • May have fever and difficulty breathing http://www.brainpop.com/health/bodysystems/respiratorysystem/ • http://www.brainpop.com/science/cellularlifeandgenetics/cellularrespiration/