Venous blood as it enter the lungs contains H.Hb, HbCO2 and bicarbonate. List in correct order...

Venous blood as it enter the lungs contains H.Hb, HbCO2 and bicarbonate. List in correct order the series of reactions from the oxygenation of deoxyHb (HHb) in the lungs to the delivery of O2 to peripheral tissues

Expert Solution

Venous blood, also called as deoxygenated blood or impure blood, comes from the peripheral tissues to heart into right atriam via two vena cavas from where it enters into right ventricle. From right ventricle, it is carried to the lungs by pulmonary artery for pulmonary exchange or external respiration. Venous blood contains haemoglobin in deoxygenated (reduced) form HHb or in reversible complex with CO2 (carbamino-haemoglobin- HbCO2).

1. Venous blood enters into the lungs and reachs the alveoli by the cappillaries surrounding the alveoli. Pulmonary gas exchange takes place between alveoli and surrounding cappillaries wherein carbon dioxide is relasead by cappillaries into alveoli in excahnge of oxygen.

Hb + O2 ---------------------------------------> Hb—O2
Reduced hemoglobin Oxygen Dissociation Oxyhaemoglobin

2. Oxygenated blood containing oxyhaemoglobin leaves the lungs and reaches left atrium of heart via pulmonary vein. From left atrium, blood is pumped into left ventricle and then via aorta redistributed to the peripheral tissues.

3. Arterail blood in arterial capillaries (high PO2, low PCO2) on reaching peripheral tissues cells (low PO2, high PCO2) gives up the oxygen to the tissues in excahnge of carbon dioxide which is taken up by capillaries from tissues.

gladiator answered 1 year ago

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