The Bohr effect

S M
Mind Map by S M, updated more than 1 year ago
S M
Created by S M about 5 years ago
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AS - Level AS Biology Mind Map on The Bohr effect, created by S M on 11/10/2015.

Resource summary

The Bohr effect
1 It describes the effect that an increasing concentration of carbon dioxide has on the haemoglobin. (in respiring tissues)
1.1 ~carbon dioxide enters the RBC forming carbonic acid, which dissociates to release hydrogen ions.
1.1.1 ~these hydrogen ions affect the pH of the cytoplasm, making it more acidic
1.1.1.1 ~changes in pH can affect the tertiary structure of the Hb =increase acidity reduces the affinity of Hb for O2.
1.1.1.1.1 =Hb unable to hold as much O2, & O2 is released from the oxyhaemoglobin to tissues
2 CO2 lowers the affinity of Hb for O2. O2 will dissociate more easily.
2.1 With a higher pCO2 the oxygen association/dissociation curve moves to the right. This is because CO2 increases the dissociation of oxyhaemoglobin to O2 + Hb
3 So in tissues where respiration is taking place (muscles), CO2 is produced. =CO2 transport to occur & H+ to bind to Hb to make haemoglobonic acid.
3.1 This process results in O2 being released, & less O2 being able to associate
3.1.1 So, when more CO2 is present, Hb becomes less saturated with O2 = change in curve (RIGHT & DOWNWARDS) =Bohr shift.
3.1.1.1 This Bohr effect = more O2 release where more CO2 is produced in respiration ~just what the muscles need for aerobic respiration to continue.
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