Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
Which of the following best describes how haemoglobin transports oxygen in the blood?
oxygen binds directly to red blood cells
oxygen binds to white blood cells
oxygen is transported dissolved in the plasma
oxygen binds to iron in haem groups forming oxyhaemoglobin
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How many oxygen molecules can each haemoglobin molecule carry?
2
1
4
3
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Where does most oxygen dissociate from haemoglobin?
in the heart
in the arteries
in the lungs
at respiring body cells
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What happens when haemoglobin binds with one oxygen molecule?
it releases all bound oxygen
it changes shape so it becomes easier to bind another oxygen
it breaks apart into individual subunits
it becomes harder for more oxygen to bind
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How does fetal haemoglobin differ from adult haemoglobin?
fetal haemoglobin cannot bind oxygen
fetal haemoglobin has lower oxygen affinity
fetal haemoglobin can carry more oxygen molecules
fetal haemoglobin has higher oxygen affinity
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What is the Bohr effect?
haemoglobin has a lower affinity for oxygen at higher pCO2
haemoglobin has a higher affinity for oxygen at higher pCO2
haemoglobin has a lower affinity for carbon dioxide at higher pO2
haemoglobin has a higher affinity for carbon dioxide at higher pO2
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What happens to the oxygen dissociation curve during the Bohr effect?
it shifts to the left
it becomes flatter
it becomes steeper
it shifts to the right
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What happens to the hydrogen carbonate ions (HCO3-) produced in red blood cells during the Bohr effect?
they bind to haemoglobin
they are immediately converted back into CO2
they are used to produce more carbonic acid
they leave the red blood cells and are transported via plasma
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In the capillaries in the lungs, oxygen binds to in haem groups forming oxyhaemoglobin.
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What is the term for the movement of chloride ions (Cl-) into red blood cells to maintain the charge balance during the Bohr effect?
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Which enzyme catalyses the reaction between CO2 and H2O in red blood cells?
catalase
carbonic anhydrase
haemoglobin
cytochrome oxidase
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What happens to the H+ ions produced from the dissociation of carbonic acid in red blood cells to prevent blood from becoming too acidic?
they leave the red blood cells
they are used to produce more CO2
they bind to haemoglobin, forming haemoglobinic acid
they bind to hydrogen carbonate ions
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