17785993
Description
Flashcards by Sam Gunnell, updated more than 1 year ago
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Created by Sam Gunnell
about 5 years ago
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| Question | Answer |
| What is the fancy name for red blood cells? | Erythrocytes |
| How are red blood cells adapted to their function? | They are biconcave to increase their SA:V ratio Haemoglobin is close to the plasma membrane so exchange of substances can occur easily |
| Why do red blood cells have no nucleus, no mitochondria, and no endoplasmic reticulum? | So there is more space for haemoglobin |
| What is the fancy name for oxygen leaving the haemoglobin? | Dissociation |
| What type of protein is haemoglobin? | Globular |
| How many polypeptide chains does haemoglobin have? | Four |
| What allows haemoglobin to attract oxygen? | The haem group has an affinity to oxygen so attracts it |
| What is meant by the symbol "pO2"? | Partial pressure of oxygen The measure of oxygen concentration |
| Is there a high or low partial pressure of oxygen at respiring tissue? | Low |
| What is oxygen affinity? | The tendency for a molecule to bind with oxygen |
| What happens to the oxygen affinity of partial pressure of oxygen increases? | It increases (positive correlation) |
| Where does fetal blood obtain all its oxygen? Explain how this happens | The mother's blood in the placenta The two don't mix but pass close enough to each other to allow diffusion to occur fro one to another |
| Does fetal haemoglobin have stronger, weaker or equal affinity for oxygen? | Stronger affinity |
| True or false - Fetal blood can obtain oxygen at a lower pO2 due to its greater affinity for O2 | True |
| What are the three ways CO2 is transported in the blood? | Carried dissolved in plasma Combining with haemoglobin Diffuses into red blood cells |
| Inside the red blood cell, a reaction takes place with CO2 and H20, what is the product? CO2 + H2O ---- ??? | H2CO3 (carbonic acid) |
| The carbonic acid inside the red blood cells dissociates. What is produced? H2CO3 ----- ?? + ?? | H2CO3 ---- H+(ion) + HCO3- (hydrogen carbonate ion) |
| What happens to the H+ ions? | They combine with haemoglobin forming haemoglobic acid which causes the release of oxygen |
| What happens to the hydrogen carbonate ions? | They diffuse into the plasma where they are carried around the body |
| What is the bohr effect? | Where oxygen is more readily released from oxyheamoglobin in areas of more CO2 |
| If a tissue has an increased concentration of CO2, what effect will it have on the curves in the bohr shift graph? | The curve will shift to the righ |
| Why do we need the bohr shift? | SO that oxygen can be more readily supplied to respiring tissue |
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