Question

By which way oxygen and carbon dioxide transported in human beings?

• A. Carbo-oxyhemoglobin
• B. Oxyhaemoglobin, carbaminohaemoglobin
• C. Oxyhaemoglobin, carbaminohaemoglobin, oxygen and carbon dioxide dissolved in plasma
• D. Oxy-carboxyhemoglobin

Answer 1

The correct option is C Oxyhaemoglobin, carbaminohaemoglobin, oxygen and carbon dioxide dissolved in plasma

Blood is the medium of transport for O${}_2$ and CO${}_2$. About 97 per cent of O${}_2$ is transported by RBCs in the blood.

The remaining 3 per cent of O${}_2$ is carried in a dissolved state through the plasma. Nearly, 20-25 per cent of CO${}_2$ is transported by RBCs, whereas, 70 per cent of it is carried as bicarbonate.

About 7 per cent of CO${}_2$ is carried in a dissolved state through plasma. Haemoglobin is a red coloured iron containing pigment present in the RBCs. O${}_2$ can bind with haemoglobin in a reversible manner to form oxyhaemoglobin. Each haemoglobin molecule can carry a maximum of four molecules of O${}_2$. CO${}_2$ is carried by haemoglobin as carbamino-haemoglobin (about 20-25 per cent). This binding is related to the partial pressure of CO${}_2$.