Question

How is oxygen and carbon dioxide transported in human beings?
A. Oxyhaemoglobin, carbaminohemoglobin
B. Oxyhaemoglobin, dissolved oxygen, carbaminohemoglobin, dissolved carbon dioxide, bicarbonate.
C. Oxy-carbo haemoglobin
D. None of these

Answer 1

Hint: Transportation of gases can occur in different forms.

Complete answer:
1. Oxygen is transported in human beings in two forms as a simple physical solution and in combination with haemoglobin.
2. Oxygen dissolves in water of plasma and is transported in this physical form.
3. Oxygen combines with haemoglobin in blood and is transported as oxyhaemoglobin.
4. Carbon dioxide is transported in the blood in three ways, as dissolved form, as carbamino compounds, as bicarbonates.
5. Carbon dioxide dissolves in the fluid plasma forming a simple solution.
6. Carbon dioxide combines with water and from carbonic acid but carbonic acid is an unstable compound so it readily dissociates into bicarbonate and hydrogen ions.
7. Carbon dioxide combines with haemoglobin to form carbaminohemoglobin.

So, the answer is B. Oxyhaemoglobin, dissolved oxygen, carbaminohemoglobin, dissolved carbon dioxide, bicarbonate.

Note: About 97% of oxygen is transported in the form of oxyhaemoglobin. 63% of carbon dioxide is transported as bicarbonates. 30% of carbon dioxide is transported as carbamino compounds.