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The need for energy

The need for energy. The structure and function of the lungs. The internal structure of the lungs. The lungs are part of the respiratory system and help the body take in oxygen and release carbon dioxide.

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The need for energy

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  1. The need for energy The structure and function of the lungs

  2. The internal structure of the lungs • The lungs are part of the respiratory system and help the body take in oxygen and release carbon dioxide. • Every time a person takes a breath, his lungs fill with air and help carry oxygen to his bloodstream. • The lungs work with other parts of the respiratory system to maximize oxygen intake. • http://www.bbc.co.uk/bitesize/standard/biology/the_body_in_action/the_need_for_energy/revision/3/

  3. Cilia and mucus The trachea and bronchi are lined with tiny hair-like cilia and glandular cells which secret sticky mucus. The rhythmic beating of the cilia sweeps mucus containing trapped dust and germs upward to the larynx from where it passes into the oesophagus.

  4. Cartilage • The trachea and bronchi are held permanently open by incomplete rings of cartilage. Otherwise they would collapse and close, leading to suffocation.

  5. Before-head

  6. After • After

  7. Gas Exchange • Inspiration. • Contraction of the muscles pulls the rib cage out and up. At the same time, contraction of the diaphragm lowers the floor of the chest cavity. The volume of the chest cavity is therefore increased (and so the pressure is decreased) causing air to be inhaled. • Expiration • On relaxation of the muscles, the rib cage moves down and in. Relaxation of the diaphragm (back to its dome shape) causes a reduction in volume (and increase in pressure) of the chest cavity. Air is therefore exhaled.

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