Concept explainers
To draw: An oxygen–hemoglobin dissociation curve that represents systemic venous and systemic arterial blood.
Introduction: A hemoglobin molecule is a protein composed of four subunits. Each subunit of the hemoglobin molecule can bind to one molecule of oxygen.
To determine: The adaptive importance of the plateau.
Introduction: The shape of the oxygen–hemoglobin dissociation curve plays a significant role in understanding oxygen exchange. The curve has a flat portion or plateau portion between 70 and 100 mmHg
To determine: The adaptive importance of the steep portion.
Introduction: An oxygen–hemoglobin dissociation curve has a sigmoidal shape. This is because each subunit of the hemoglobin molecule can bind with one molecule of oxygen. The reactions of four subunits sequentially take place.
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Vander's Human Physiology
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