Question

Which of the following incorrectly describes mechanisms of CO2 transport? 1.just over 20% of CO2 is carried in the form of carbaminohemoglobin 2.attached to the heme part of hemoglobin 3.7-10% of CO2 is dissolved directly into the plasma 4.as bicarbonate ions in plasma

Answer 1

Answer: 3. 7-10% of CO2 is dissolved directly into the plasma

Explanation:

Carbon dioxide molecules are transferred by one of three methods into the blood from body tissues to the lungs including binding to haemoglobin, movement as a bicarbonate ion and absorption directly into the blood. Various carbohydrate properties in the blood influence its movement that are as following:

1. Carbon dioxide is more soluble than oxygen in the blood. The plasma dissolves about 5 to 7 per cent of all carbon dioxide.
2. Carbon dioxide may bind to plasma proteins, or may penetrate red blood cells and bind to haemoglobin and form carbaminohemoglobin which cover 20% of CO2.

Hence, the correct option is 3.