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level: Level 1 of Oxygen dissaciation

Questions and Answers List

level questions: Level 1 of Oxygen dissaciation

QuestionAnswer
The structure of the Haemoglobin- 4 polypetide chains Quaternary structure -
OxyhaemoglobinOxygen bound to the Haemoglobin
Oxygen dissociationOxygen detaches from the haemoglobin
AffinityHow strongly oxygen is attracted to the haemoglobin
% haemoglobin saturation for oxygen% of haemoglobin attracts oxygen number of oxyhb mols/ maximum number of hb molecules x 100
Partial pressure of Oxygen pp0 or po2concentration of oxygen
Partial pressure of Carbon dioxide ppCO2 or pCO2concentration of co2
THE LUNGShigh po2 therefore hb molecules have a high affinity for oxygen therefore oxygen molecules bind to hb hb becomes nearly 100% saturated
THE MUSCLESlow p02 due to respiration in cells therefore hb molecules have a lower affinity for oxygen therefore oxygen dissociates from hb so oxygen can diffuse into the tissue cells
Oxygen haemoglobin curve shapeSigmoid - S
Point to remember1. Partial pressure 2. Affinity hb and ox 3. 02 binds or dissociates
The Bohr effect-curve shifts right - Decreases affinity so more dissociation of 02 from Hb - The greater pCo2 the more 02 dissociation - released so more respiration
The effect of temp on O2 curveHigher temp means more respiration as it releases heat so more c02 levels so less affinity so more disassociation
Adaptions of the haemoglobin-foetal hb has higher affinity than maternal, so oxygen from mum can bind to it - high altiudes = more hb