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A-Level Biology OCR A

Oxygen Higher Partial Organisms Low High Pressure Shift

Llamas have a left-shifted oxygen dissociation curve to capture more oxygen in low partial pressure environments. Mice, with high oxygen demands, have a right-shifted curve to unload more oxygen at higher partial pressures.

Las llamas tienen una curva de disociación de oxígeno desplazada a la izquierda para captar más oxígeno en ambientes de baja presión parcial. Los ratones, con altas demandas de oxígeno, tienen una curva desplazada a la derecha para descargar más oxígeno a presiones parciales más altas.

Front Draw and annotate graphs for oxygen dissociation curves for organisms that live in relatively low partial pressures of oxygen and for organisms with high oxygen demands. Explain value of the shape of the curve to the organism.
Back
  • Llama (low partial pressure) - shift to left bc it needs higher affinity for oxygen in order to take in higher proportion of oxygen from atmosphere
  • Mouse (high oxygen demand) - shift to right bc it needs to be able to unload higher proporiton of O2 at higher partial pressure of O2

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