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Year 9 Science 2013

Year 9 Science 2013. Control & Coordination Part 1 The Respiratory System. Gas Exchange. Oxygen and carbon dioxide need to be exchanged with the environment for ___________and _____________. Diffusion.

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Year 9 Science 2013

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  1. Year 9Science 2013 Control & Coordination Part 1 The Respiratory System

  2. Gas Exchange Oxygen and carbon dioxide need to be exchanged with the environment for ___________and _____________

  3. Diffusion The process of gas exchange is always by _____________between the external and internal environment of the organism.

  4. Surface Area: Volume For single-celled and small organisms this is not a problem because of their high ___________to __________ratio.

  5. Multicellular Organisms Large organisms rely on specialised __________surfaces.

  6. Features of Respiratory Surfaces Large____________ ______, _______and easily penetrable surface. Adequate____________ Efficient transport of carrier fluid_________) across respiratory surface.

  7. Mammalian Respiratory System Is composed of: • Lungs • Respiratory passages • ___________ • ___________ • ____________ • _____________ • _____________

  8. Alveoli The site of________________ Increases the surface area for gas exchange. http://www.bmu.unimelb.edu.au/examples/gasxlung/

  9. Breathing Contraction & relaxation of the __________muscle results in changes in pressure within the lung cavity, forcing air in & out.

  10. Epiglottis The ___________prevents food from travelling down the trachea and blocking the passage of air.

  11. Gas exchange relies on diffusion, therefore ______________gradients need to be maintained.

  12. For oxygen to continually diffuse into capillaries around alveoli, oxygen needs to be transported ___________from the site

  13. Respiratory pigments such as ___________carry oxygen in the blood from lungs and release oxygen into cells.

  14. Rhythmic pumping of the __________ensures continuous flow of blood along capillaries surrounding the alveoli.

  15. Haemoglobin and _____________bind in a reversible reaction.

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