The carbon dioxide is transported via blood to lungs mostly

Explanation

All options are explained below: a)in combination with haemoglobin only:This statement is not entirely accurate. While a small portion of carbon dioxide can indeed combine with hemoglobin to form carbaminohemoglobin, this is not the primary method of CO2 transport in the blood. The majority of CO2 is transported differently. b) dissolved in blood plasma:This statement is accurate. A portion of carbon dioxide is transported in the blood in its dissolved form, meaning it is physically dissolved in the liquid component of the blood, which is called plasma. This allows for the efficient transport of CO2 but it is only in a small proportion. . c) in the form of bicarbonate ions (Correct Option):This statement is accurate. The primary method of carbon dioxide transport in the blood is in the form of bicarbonate ions (HCO3-). Carbon dioxide combines with water in the blood to form carbonic acid (H2CO3), which then dissociates into bicarbonate ions and hydrogen ions. This bicarbonate ion transport is the most important mechanism for transporting CO2 from body tissues to the lungs for exhalation. d) as carbaminohaemoglobin and as carbonic acid: This statement is partially accurate. As mentioned earlier, a small portion of CO2 can combine with hemoglobin to form carbaminohemoglobin. However, the more significant mechanism involves the formation of bicarbonate ions as described in option C. Correct Option: C. in the form of bicarbonate ions Summary: The majority of carbon dioxide is transported in the blood in the form of bicarbonate ions (HCO3-). This is the primary mechanism by which CO2 is transported from body tissues to the lungs for exhalation. A smaller portion of CO2 can also be transported by dissolving in the blood plasma and combining with hemoglobin to form carbaminohemoglobin. The formation of carbonic acid is an intermediate step in the conversion to bicarbonate ions.