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52848
HEMOGLOBIN
Descripción
Mapa Mental sobre HEMOGLOBIN, creado por Susy Sanchez el 22/04/2013.
Mapa Mental por
Susy Sanchez
, actualizado hace más de 1 año
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Creado por
Susy Sanchez
hace alrededor de 11 años
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Resumen del Recurso
HEMOGLOBIN
Structure
4 Globin
Polypeptide chains
A and B
4 Heme groups that bind O2
4 O2/Hb
Hemoglobin and O2 Transport
Iron
Containing protein found in RBC transports respiratory gases
Loading (Hb bindding to O2) occurs in lungs
Unloading occurs in tissues
Affinity of Hb for O2 changes with a number of physiological variables
Temperature altitude pH
Most 02 in blood is bond to Hb inside RBC as OXYHEMOGLOBIN
Hb increases the O2 carrying capacity of blood
Carbon Monoxide & O2 Transport
Carboxyhemoglobin
Heme combined with CARBON MONOXIDE
Bond with CO is 250 times stronger than bond with O
so heme cannot bind 02
Thus interferes with Oxygen carrying capacity of blood
Hemoglobin & O2 transports
O2 Carrying capacity of blood also depends on Hb Levels
ANEMIA
Hb levels are below normal
Reduction of RBC
physiological adaptations include:
each RBC produces more DPG
Hb production normally controlled by Erythropoietin
Stimulated by low PO2
High PO2 of lungs favors loading
Low PO2 in tissues favors unloading
Hb 02 affinity should allow maximum loading in lungs & unloading in tissues
Oxyhemoglobin Dissociation Curve
Hb-oxygen binding depends on oxygen pressure (amount)
98% Saturation at 100mmHg oxygen (arteries )
75% Saturation at 40mmHg at 40mmHg oxygen (veins)
60 mmHg unloaded at tissues
Bohr Effect
Hb-Oxygen affinity decreases due to pH, increase CO2 and Increase temperature
Occurs in metabocally active tissues
caused Hb-O2 curve to shift right (more unloading
Oxygen INCREASES at lungs DECREASES Hb-CO2 affinity (Haldane Effect)
Effect of hypoxia on O2 transport
Hypoxia LOW OXYGEN
Less oxygemoglobin
less tissue transport
2,3 DPG gycolysis by product RBC no mitochondria
Binds to Hb
Adaptations to hypoxia:
DECREASE DPG INCREASES HB OXYGEN AFFINITY
INCREASE DPG DECREASES OXYGEN AFFINITY AND FACILITATES DELIVERY TO TISSUES
Fetal Hemoglobin
Cant bind DPG
Have higher O2 affinity thus facilitates mother fetus oxygen delivery
Pathologies
SICKLE-CELL ANEMIA
Affects 8-11% African A.
Valine substituted fro glutamic acid on B chains
Formation of hemoglobin S
RBC become fragile, rigid sticky and clump together
Impaired O delivery to organs
Reactivation of HbG HYDROXYUREA AS A TREATMENT
Thalassemia
Mostly affects people of Asian Mediterranean origin
Failure in production of either B or A chains
Small RBCs
Anemia
Imapired Oxygen delivery to organs
CABON DIOXIDE TRANSPORT
CO2 transported in blood as:
dissolved CO2 in plasma 10%
Bicarbonate ion HCO3- 70%
Carbaminohemoglobin 20%
Carbonic anhyfrase catalyzes formation of H2CO3
Carbonic acis from CO2 + H2O Dissociates into H+ and HCO3-
ACIDOSIS
pH lower than 7.35
Respiratory acidosis caused
Hypoventilation
Causes rise in blood CO2 & carbonic acid
Metabolic Acidosis
Result form excess nonvolatile acids
fat breakdown in diabetes or loss of HCO3- in diarrhea
Alkalosis
pH greater 7.45
Respiratory alkalosis
hyperventilation
too little CO2
Response to high altitude low Oxygen to correct the pH balance
Metabolic Alkalosis
caused by too much HCO3- or too little acids
from vomiting out stomach acid
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