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13 Cards in this Set
- Front
- Back
Precentages of Gases in the Air
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Oxygen -21%
Nitrogen -79% CO2 -.03% |
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What is respiration?
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the exchange of O2 and CO2 between the cell and the environment.
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Partial Pressures
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The Partial Pressure gradient moves gases. Moves from high to low. PO2 in lung=~105, tissues=~40. O2 moves from lungs to tissues.
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Factors that influence how much gas enters a liquid...
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1)nature of the gas - solubility
2)temo - more gas stays in cooler liquid 3)nature -solid/liquid/gas 4)pressure 5)solutes - solutes push gas out of liquid 6)resp. pigments |
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What is 'bends'?
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when scuba diving and come up to fast the pressure changes too fast and nitrogen bubbles out of your blood.
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Which is a better respiratory medium..air or liquid?
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AIR -- diffusion is 10,000 times faster and less energy is required to move air. more oxygen per liter of air
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What could cause a fish die-off?
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If the water temp increased then the oxygen would diffuse out and the fish would not have enough oxygen to survive.
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What is the problem with a spherical organism?
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sphere has less SA for diffusion. has to be the size of a pin-head b/c a larger radius requires a larger PO2
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Diffusion
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Diffusion is proportional to distance squared
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How do we get oxygen from outside of body to inside and obtain enough O2?
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circ. system, lungs/gills, and a tracheal system, resp. pigments, large organism must be flat
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why is respiration so important?
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We need O2 to get rid of CO2 so we can make ATP
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CO2
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major byproduct of Krebs cycle
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O2 and respiration
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O2 is the final electron acceptor in the electron tansport chain
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