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Respiratory System

Respiratory System. IN comes the OXYGEN, OUT goes the CARBON DIOXIDE!. Respiratory System: Function. To bring about exchange of oxygen and carbon dioxide in the blood Oxygen fuels cellular respiration Carbon dioxide is a waste product from cellular respiration. Respiratory System: The Parts.

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Respiratory System

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  1. Respiratory System IN comes the OXYGEN, OUT goes the CARBON DIOXIDE!

  2. Respiratory System: Function • To bring about exchange of oxygen and carbon dioxide in the blood • Oxygen fuels cellular respiration • Carbon dioxide is a waste product from cellular respiration

  3. Respiratory System: The Parts • Nose and Mouth • Bring in oxygen, expel carbon dioxide • Why do you have nose hairs??? • To clean incoming air of dirt and other harmful substances • Pharynx: • Passageway for air • Larynx: • Located at end of pharynx • Contains the VOICE BOX • Trachea: • Air is cleaned by mucus and CILIA (tiny hairs)

  4. Respiratory System: The Parts con’t.. • Bronchus (pl. Bronchi) • Very large tubes that branch from trachea • Each leads to one LUNG • Bronchioles: • Each bronchus branches into these smaller tubes • Spread throughout each lung

  5. Respiratory System: The Parts con’t.. • Alveoli: • Tiny air sacs located at the end of bronchioles in the lungs • Site of gas exchange in the lungs • Surrounded by capillaries! • Oxygen diffuses into blood stream, Carbon dioxide diffuses out • Look like bunches of grapes!

  6. Gas exchange in alveoli

  7. Respiratory System: Breathing • Driven by air pressure created by chest cavity • Air moves from High to Low pressure • Diaphragm: • Large, flat muscle located at the bottom of the lungs • Inhalation: • Diaphragm FLATTENS AND CONTRACTS allowing air into the lungs • Chest cavity EXPANDS • Exhalation: • Diaphragm RISES AND RELAXES forcing air out of lungs • Chest cavity COLLAPSES Let’s see this in action!

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