Dissociation graphs

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International Baccalaureate Biology (Ventilation) Flashcards on Dissociation graphs, created by Lauren Parker on 05/12/2021.
Lauren Parker
Flashcards by Lauren Parker, updated more than 1 year ago
Lauren Parker
Created by Lauren Parker over 1 year ago
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Question Answer
At the lungs what is the ppO2 and why? ppO2 is high therefore Hb is saturated with O2.
Why is a steep drop in % saturation in a slight change of ppO2 an advantage? What would the gradient look like? Muscles are supplied with oxygen much faster
What happens to the affinity of oxygen from hb as blood travels to respiring tissues and why is this important? affinity of O2 from hb decreases important because O2 has to be taken up by the muscles
What is the ppO2 at respiring tissues? What happens to hb? low ppO2 and hb loses its O2
if hb loses it's O2 is it more or less saturated? less
what do dissociation graphs show? show % saturation of hb with oxygen against the ppO2 in the tissues
what does ppO2 mean? partial pressure of oxygen = concentration of O2 in tissues
when there is an increase in CO2 concentration where does the gradient move to and what do we call this? gradient shifts right this is called a bohr shift
why is a bohr shift an advantage? when excercising, the hb has a lower affinity for O2 and loses it quicker to the muscles therefore, they can continue to respire aerobically
when might a bohr shift occur? when carbon dioxide levels rise eg in excercise
is there more or less O2 in the atmosphere at altitude? less
how might a person's blood differ if they live at high altitudes than if they live at regular altitudes? at high altitudes a person will have: - an increased erythrocyte count - an increased haemoglobin count - their hb has a higher affinity for O2
why might a person who lives at high altitude's hb have a higher affinity for O2? To make up for the lack of O2 in the air
How might a peruvian's dissociation curve differ to a european's? a peruvian has a steeper curve (on the left) with saturated Hb at a lower ppO2 in lungs, and a quicker release to respiring tissues
will a foetus have a higher affinity for O2 than their mother? why? will the foetus' gradient be further left or right? foetal hb must have a higher O2 affinity than mother as the foetus takes O2 from mothers blood the foetus has a very steep curve to the left which means that foetal Hb will give O2 to the growing tissues quickly
what is myoglobin? a pigment in muscles that acts as a store of O2.
does myoglobin have a lower affinity for O2 than hb? Why/ why not? myoglobin has a higher affinity for O2 than hb so that it can take O2 from Hb but will quickly release O2 when muscles need it (very steep curve)
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