Answer:
Maybe if his fists are clutched he is holding a part of his body in pain and maybe if he is making tense faces
Explanation:
The olfactory nerve is a nerve that functions in use for the sense of smell
Hypercapnia, also known as hypercarbia and CO2 retention, is a condition of abnormally elevated carbon dioxide (CO2) levels in the blood. Carbon dioxide is a gaseous product of the body's metabolism and is normally expelled through the lungs.