Comparative Respiratory Systems

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Comparative Respiratory Systems

• Biology 11
• G.Burgess
• 2006

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Respiratory Systems

• Major function is to transfer gases to and from
  the tissues of the organism.
• Plants must transfer O2 and CO2 between the plant
  tissues and air during cellular
  respiration(night) and photosynthesis(day).
• Stoma, pores in the leaves of plants allow the
  transfer of these gases.

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In Plants

• During photosynthesis O2 is released by the
  fluids in the stoma and CO2 is absorbed.
• During cellular respiration, O2 is absorbed by
  the stoma and CO2 is being released.

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In Animals

• Unicellular animal-like organisms and those
  organisms at the tissue level of organization
  (cnidarians, poriferans) use absorption and
  diffusion to receive needed O2 and get rid of CO2.

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Respiration in higher level animals

• Invertebrates that require a respiratory organ
  may have spiracles or book lungs
• Vertebrates that require respiratory organs may
  have lungs or gills.
• Though lungs are usually found with in the
  organism, there are some organisms that have
  their lungs on their exterior.

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Respiratory Organs
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Exterior Lungs
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Human Respiratory System

• Series of tubes beginning in the pharynx and
  ending in alveoli (air sacs)
• Air is breathed in with the help of the
  diaphragm.
• Alveoli have moist layers for gases to dissolve
  from the air to tissue fluid

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Functioning of the diaphragm

• To move air into the lungs, the diaphragm is
  pulled down.
• To move air out of the lungs, the diaphragm is
  pushed up.

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Bibliography

• All images found at Biodidac, http//biodidac.bio.
  uottawa.ca/, Dec. 12,2006.