Out of 5L of blood How manyml of O2 is delivered to tissues at physiological rest condition
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Answer:
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Answer:
Haemoglobin is the major iron-containing pigment that helps in the transport of gases. Each haemoglobin molecule can carry a maximum of four molecules of oxygen. Binding of oxygen with haemoglobin is primarily related to partial pressure of O2
. In alveoli, where there is high pO 2
, low pCO2
, lesser H+
concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin. In tissues,where low pO
2
, high pCO2
, high H+
concentration and high temperature exist, the conditions favourable for dissociation of oxygen from the oxyhaemoglobin. Every 100 ml of oxygenated blood can deliver around 4 ml of O2
to tissues under normal physiological conditions. A 100ml of oxygenated blood can carry 20ml of O2
. However, only 4 ml is delivered to the tissues.
The exchange of gases between the external environment and the tissues is the transport of oxygen and carbon dioxide to and from the lung by the blood. Carbon dioxide is carried physically dissolved in the blood, chemically combined with blood proteins as carbamino compounds, and as bicarbonate.
Oxygen is transported both physically dissolved in the blood and chemically combined to the haemoglobin in the erythrocytes. Much more oxygen is normally transported combined with haemoglobin than is physically dissolved in the blood. 15ml of oxygen is delivered by 100ml of oxygenated blood to the tissues under normal physiological conditions.