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Respiratory System

Learn about the functions and parts of the respiratory system, including how it facilitates gas exchange in the body. Explore the crucial role of organs like the lungs, bronchioles, and alveoli in breathing and oxygenation. Discover the mechanisms of inhalation and exhalation driven by the diaphragm and chest cavity.

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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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