ï»¿ Explain why the following happen : (a)Â Far more oxygen is released from oxyhaemoglobin in a more active tissue than in a less active one. (b)Â Oxygenation of blood promotes the release of carbondioxide from blood in the lungs. Â  from Biology Breathing and Exchange of Gases Class 11 Assam Board

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Explain why the following happen :

(a)Â Far more oxygen is released from oxyhaemoglobin in a more active tissue than in a less active one.

(b)Â Oxygenation of blood promotes the release of carbondioxide from blood in the lungs.

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(a) Far more oxygen is released from oxyhaemoglobin in a more active tissue than in a less active one.- This is because in more active tissue PO2Â is lower and PCO2Â is higher. The PO2Â is much lower and the PCO2Â is much higher in an active tissue than less active.Â Both these favour dissociation of oxyhaemoglobin to deoxyhaemoglobin and molecular oxygen.

(b)Â Oxygenation of blood promotes the release of carbondioxide from blood in the lungs - Â because oxyhaemoglobin is a stronger acid than deoxyhaemoglobin. So, it denotes H+Â ion which combine into water and CO2Â by carbonic anhydrase. Bicarbonates release CO2. Affinity of haemoglobin for oxygen is enhanced due to the release of CO2Â from blood in lungs which causes fall in PCO2Â of blood.

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By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
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70% of carbondioxide is transported as ?

Bicarbonate
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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What is the partial pressure of oxygen in Â oxygenated blood ?

95 mm Hg
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Name the cavity having lungs.

Thoracic cavity.
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