Question

the majority of carbon dioxide (co₂) is transported in the blood in the form of.
dissolved co₂
bicarbonate ions
bound to hemoglobin
carbonic acid
question 27
the upper airways (trachea, bronchi) consist of ______ epithelial cells
simple squamous

Explanation:

• For Question 26: Carbon dioxide is transported in the blood in three forms: dissolved \(CO_2\) (about 7%), bound to hemoglobin (about 23%), and as bicarbonate ions (\(HCO_3^-\), about 70%). So the majority is in the form of bicarbonate ions.
• For Question 27: The upper airways (trachea, bronchi) consist of pseudostratified ciliated columnar epithelial cells. But among the given options, simple squamous is incorrect (it is for alveoli), and the other options in the first question are not relevant here. However, if we assume it's a typo - like maybe the intended option was not fully shown. But based on knowledge, the upper airways have ciliated columnar (but if forced to choose from wrong - presented options, there is an error. But if we consider standard knowledge for the first question.

Answer:

Question 26: B. Bicarbonate ions
Question 27: (There is an error in options as presented. But if we assume a standard question - upper airways have pseudostratified ciliated columnar. But since not in options, if it's a mis - upload, but for the first question answer is B)