Flashcards
Oxygen Dissociation Curves
Flashcards do conjunto (15)
- 1What is oxygen measured in in oxygen dissociation curves?partial pressure (kPa)
Normal atmospheric pressure is 100kPa, as oxygen counts for 21% of the atmosphere, it's partial pressure would be 21kPa. - 2At low concentrations of oxygen, why is it harder for the molecule to load oxygen?Due to the four polypeptide chains being so close together
- 3Once the first molecule of O2 is loaded..It is easier for the other three O2 molecules to be absorbed by the haem group.
- 4If haemoglobin has a lot of oxygen it is called.. Similarly for when it doesn't have a lot of oxygen it's called..1-saturated
2- unsaturated - 5What causes the shape of different haemoglobin molecules change?Due to different conditions/environments.
- 6The further to the left the dissociation curve...The higher it's affinity, therefore the more readily it loads oxygen but the less easily it releases oxygen.
- 7The further to the right the dissociation curve...The lower the affinity for oxygen and therefore the less easily it loads oxygen but the more readily it releases it to respiring tissues.
- 8What effect does the presence of carbon dioxide have on the affinity for oxygen?Increased carbon dioxide concentrations decreases the molecules affinity for oxygen, therefore the less readily it loads oxygen but the more readily unloads.
- 9In the lungs what is the dissociation for oxygen?High affinity due to the low concentrations of CO2 therefore more easy for the molecule to load oxygen and less readily unloads.
- 10In the tissues what is the oxygen dissociation curve like?Low affinity for oxygen due to the high concentrations of carbon dioxide from the respiring tissues, therefore the more easily it unloads oxygen but less readily loads it.
- 11What pH is dissolved carbon dioxide therefore what effect does this have on haemoglobin?slightly acidic, therefore alters the shape of the molecule so more loosely bound to the oxygen molecules meaning more readily unloads it.
- 12Therefore, if low pH changes the shape of the molecule so it releases oxygen more readily, what's the effect of high pH (low concentration of CO2) on the dissociation curve?High pH alters the shape of the molecule so that it more readily loads the oxygen (it's in high concentration) and less readily unloads it.
- 13Describe the statement 'the more active the tissue, the more readily oxygen is unloaded'.the more active, the more it respires, the more CO2 present, low pH alters shape to low affinity for oxygen, unloads O2 more easily, more O2 available for respiration.
- 14In a pregnant woman, where would the babies oxygen dissociation curve be?To the left, in order for it to pick up oxygen more readily.
- 15What is the oxygen dissociation curve of a rat in comparison to a Plaice (that lives on the bottom of the sea).Rat- low affinity for oxygen as it's active and needs to be able to easily unload oxygen to respiring muscles.
Plaice- high affinity as it's in a low oxygen environment and isn't very active, so needs to be able to hold onto oxygen and not release it readily
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- AS Biology2 (The Variety of Life) FlashCards sobre Oxygen Dissociation Curves, criado por sammi_taylor01 em 28-05-2013.
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- sammi_taylor01
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